Would you ....

So I'm getting married next year and my fiances brother has a gf who hasn't even been around a year yet but has already been talking about me to my MIL saying im standoffish and told someone close to me she thinks I really want to end up with her BF (my future brother in law) and some other things...so here's the backstory, I've been friends with her BF for 12 years, grown up around the family basically. I really tried to befriend her by inviting them places and texting her , the reason she said I was stand offish is because the first time I met her (was on Xmas) we left early to go to my grandmas to split up the day between our families. I don't get how that's me being stand offish lol I've gone out of my way to be nice to her. She's only 23 and her BF is the older brother so is this just jealousy or her feeling threatened? Now were planning our wedding, it's a destination and a 30 people max. We wanted it intimate and small. Do I invite her? They aren't married but moved in together after 4 months,  she's been talking about me a lot and has implied my relationship isn't real and I want her BF. He's like a brother to me and that's gross.  I just don't know if I want her face to be one I see before saying my vows after the things she's said. What do I do? Do I invite her? Help!

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