Fight with my brothers fiancé

I have been kicked out of my adoptive brothers wedding. I was adopted when I was 6 and I love my family more than anything. However being adopted makes some people not see me as part of the family. One person being my soon to be SIL. She's the worst person I ever met. She told people I never gave her a chance. I gave her a chance. I gave her one chance. That was all she got. And in that one chance I gave her she showed she was openly racist and didn't care about being openly racist. After she used the N word to describe people of color l made up my mind that I hated her. When I found out he was engaged to her I lost so much respect for my brother. But it's whatever. Our little brother(adopted like me) was gonna be a junior groomsman since he's 17. They needed a junior bridesmaid to go with him so my brother asked if my daughter (14) could be a junior bridesmaid. I asked her and she wanted to. My brother also asked me to be the Host so I said sure. I may not like her, but at the end of the day that's my brother. I should have realized being in her wedding was gonna be a nightmare. She bitched about every little thing. She also made it completely about her. Anything my brother wanted didn't matter. If it wasn't about her she would throw a bitch fit. She got mad because all the other bridesmaid said they aren't paying 350 for a bridesmaid dress. Originally price she said was 100 but she tried to change it because she liked something better. She got pissy when they were trying on dresses because I'm not paying 350 for a dress my daughter will only where once and she started screaming "It's my wedding!" Bitch it's my money I don't give a fuck. So she's hear throwing a temper tantrum. My brother was there for support and was telling her to calm down and she starts yelling at him that nothing was right and everything was awful and that she doesn't want to marry him anymore because he ruins everything. A consultant told her if she keeps it up she will have to leave. The consultant was black. His fiancé told her. "Fuck off n*gg*r." I said "You can quit being a racist brat because you don't get what you want." She gets in my face and yeah don't get in my face because I don't back down. Saying I'm not even his real sister and she doesn't even want me at the wedding, I'm a bitch, blah blah blah. I told her to back the fuck out of my face. She decides to look at my daughter and say "Don't pay for the dress, but fix your daughter's ugly scar." My daughter has a scar on her forehead from a car accident

Its usually covered by her hair, but she had it pushed back. I told that bitch "Let's go outside." She said she's not going outside and I told her "Don't talk shit if you can't back it up!" I tell my daughter we are leaving and my brother tries to stop us and talk to me but I told him if he wants to marry that(I pointed at her) go right ahead, but I'm done. I'm so pissed over the whole thing, but if he wants to marry that racist, bratty, train wreck he can go right ahead. Like I said I don't have a lot of respect for my brother because to marry someone like that makes you just as bad in my opinion.