Ok, so, I'm not very good at advice, but I suggest you talk to her about the copying she's doing.Make sure you don't sound accusing, and just talk to her casually, so she doesn't get mad.Tell her that you will allow her in your group, but she has stop copying you guys.Also, don't go up to her and be all like "stop copying us, cuz we ain't gonna let you in our group" but explain it to her slowly, and try to get her to back off a little.Hope that helped!
P.S. this is not LLM, but I just thought I'd answer anyway