I am needing some help ladies. I have 2 bridesmaids (sisters) and 1 maid of...

I am needing some help ladies. I have 2 bridesmaids (sisters) and 1 maid of honour. My parner doesnt like my moh as she can be quite immature and has to have her say in many things. I.e girls going walking but I changed plans so my partner could go out. And I got a cheeky text reply. How do I tell her I don't want her as my moh now xx