I need advice on kicking a bridesmaid out 😭

This bridesmaid has caused more drama and stress than the entire wedding planning as a whole and I am soooo exhausted and over it. People keep telling me to not let it ruin my wedding experience and to just not stress about it but I have such bad anxiety!!! I’m so scared that even 5-10 years down the road when I look back at my wedding planning im going to have panic attacks because of how stressed and anxious I am literally over this ONE person

It’s my fiancés sister which makes this even harder!! He wants to stick it out and see if she does anything else but im honestly ready to hand her cash to pay her back for the dress and her husbands suit and call it a day

Im also TERRIFIED of his mother!!! She’s so cold and such a bitch to the point where when she’s talking to someone and telling a story or whatever I genuinely can not tell if she’s happy or pissed off unless she laughs a few times during her story!!!

I just don’t know what to do 😭😭😭

I just want to grab cash and have my fiancé go to her house and sit her down and be like “look, the way you’ve been disrespecting my fiancé is unacceptable. We hope this doesn’t ruin our relationship with you, and it doesn’t have to. We just feel like it would be better for our relationship to not have you in the wedding. Here is the money to pay you back for the dress and suite.”

Idkkkkkk 😭😭😭😭

If someone has a better sentence that makes it sound better that would be great help😭