Should I put my fiancee cousin in my wedding

So the other day my fiancee cousin(female) flips out on me cuz I did not choose her to be my bridesmaid. First let me state this her and my fiancee do not have the relationship she think they do. He can't stand her but they grew up together when they were little and she thinks there brother and sister type relationship. She hasn't spoke to him at all in 2 years plus and has always been a trouble maker. I don't want her in my wedding at all but I want to keep peace and am willing to suck things up. What do u think should I let her be a bridesmaid to keep peace?

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