I have a quick question, am I being really petty or is my stance justified?...

I have a quick question, am I being really petty or is my stance justified? I have a friend who doesn't have the best track record for sticking to plans and cancels all the time when it is my turn to arrange plans. Despite this, we still are friends however I now expect to be cancelled on. I have invited her to my wedding and hen. Can't come to the wedding due to newly booked holiday, after invites went out. Said would definitely make hen. But now cancelled. She is having money troubles and is siting this as the reason yet is on FB posting about dinners out and new purchases. She is now asking to meet up and I haven't replied, why should I always be the one to give? I have had enough. Advice please ????