So in an interesting turn of events she brought her new bf last night. My bf mentioned that once they were chatting after the performance she essentially completely ignored her bf and was very “friendly” towards him as he put it. I took that as an opportunity to point out she did the same at his bday and if I wanted to make a bigger deal of it I could have. So I suggested that as a friend he mention it to her that when she is in a group she needs to make more of an effort to include everyone in the convo. I’m not sure if this is a socially awkward thing or just between her and my bf. But I did make my feelings be known that I wasn’t really cool with how she acted at his party and it was noted.