Really in need or a rant!
Before getting engaged I wasn't seeing my maid of honor regularly due to conflicting shift patterns/busy lives so hadn't noticed any problems.
As soon as we got engaged I rang and asked her to be maid of honor, to which her reply was "as long as I don't have to wear yellow!!" which I found really rude and was slightly confused by as I'm the kind of girl who likes black/red/purple, infact I don't own anything yellow and I would never even consider dressing my bridesmaids in something that wouldn't be flattering to them.
Since then she's taken no interest in the wedding at all and has even hinted that I'm just getting married because I'm desperate to settle down and have kids and that I'm just marrying the first person who'd have me. (me and my fiance would both like to start a family within a year or two of getting married)

She visited last week so she could see my dress and we discussed the plans I've made so far.
We discussed chair covers and I said me and my fiance have decided against them as we are having a fairly informal reception with no wedding breakfast, we wont be having a seating plan and the tables are along 3 sides of the room, although I think they can really transform a room we are trying to keep our budget down as we're in the process of renovating our first home, once our home is done I'll be starting a business from scratch and we've booked a lovely honeymoon which cost more than double what we would normally spend on a holiday as we see it as a once in a lifetime chance to have a luxury holiday and be able to justify it (I'm generally quite stingy) I explained all this to her and said that although people might notice it that's not what they will remember about our wedding day, her response was that people will notice and will remember that we don't have them!!! I can't imagine people sitting a few years down the line and saying "do you remember beckie and adam's wedding? they didn't have chair covers!!"

We then discussed favours and I said that we had decided against favours but will be having a sweetie table as well as a very large dessert table with everyone's favorites (me and my fiance are both bakers) i've bought personalised sweetie bags with our names and wedding date on so everyone can take a bag home with them as well as a slice of cake in our personalised napkins. She said we can't not have favours as people attend weddings expecting something which I was quite shocked at as most of the people attending are family and a small amount of very close friends, I thought people would attend our wedding to celebrate with us and share our big day not because they wanted to get something from us. She said she'd be disgusted if she attended a wedding and didn't get a favour.

I also planned a crafternoon with a few friends so we could have a few drinks, make some bunting and some mock invites, I arranged it for last month and she said she'd be working double shifts that weekend and would i rearrange it for the 8th which I did and when she left last week i said i'll see you on sunday for the crafternoon she said she'd meant saturday and had gotten the date wrong and if i wanted her to come i'd have to rearrange it again!

After she left that day i felt really insulted, other friends have said to not confront her about it and to just not bother contacting her to see if the friendship fizzles out or if she bothers contacting me.

Wow-she sounds like a character :/

When are you getting married? (sorry if you already said and I just missed that) I don't know what to suggest as although I can see your friends points of view of not confronting her as it may cause an argument and they probably don't want you two to fall out... at the same time why should you put up with this, she is ruining your experience of planning your wedding and it sounds like if the mood took her she would also ruin your big day.

I do think the experience of planning your wedding is very important as well, as you will remember this for the rest of your life and you want to remember it as a happy time.

Maybe it is worth sitting her down and trying to nicely explain how the things she keeps saying make you feel and asking her if she does really want to be your maid of honour or if she just accepted as she didn't feel she could decline?

Your wedding your rules. If you don't want to do favours then don't, no one will notice and lots of people leave them behind anyway. Actually I'd say the bags count as favours anyway. The same goes for chair covers, I would have loved them but it would have cost a fortune as we are having a lot of guests, and it's not crucial. My brother didn't have them at his and it didn't detract from the appearance of the room. The afternoon that she missed could have been a genuine mistake, but I would expect my MOH to check her dates more carefully so as not to let me down. How soon is your wedding? Unless it's coming up close I would say give it time; don't necessarily rule her out as a MOH as you obviously wanted her at one point, but point out firmly but kindly that although you will listen to her opinion she doesn't have a say in decisions. Ultimately you may have to say that unless she is more supportive you will have to reconsider. Unless she is a professional wedding planner there's no reason for her to think that she knows more about weddings than you do, so don't let her put pressure on you to do things.

I'd assume the yellow dress thing was a joke.
Definitely stop making plans around her. Make plans that fit in around you and the mojority of people and if she's able to attend she can but otherwise I get the impression nothing will get done until the last minute (possibly still without her).
You DO NOT need to have chair covers - no one (except her) will judge you for it. I've been to more weddings without chair covers than ones with and not once has anyone made a comment either way about them. They are for decrative purposes only and are non-essential. Same goes with favours - they do tend to be more expected than the chair covers but again I've been to a wedding without favours and genuinely no one noticed a lack of favours until the bride came up to us to say sorry but they'd run out of budget before they could get any. The sweet table sounds lovely and is a ligitimate option for favours. When I get an invite I always feel honoured that the couple are willing to share their special day with us and start thinking out what gift to get them and what I'll wear, I'm not sitting there wondering what I'll get FROM them.
At the end of the day the things she had said about your day are just her opinions - they are not instuctions. My Mum is giving me no end of hassle about the wedding and I have now come to realise that it doesn't matter what she says about how a wedding 'should' be, our wedding will be the way we want it and so should yours.