My [23F] friend/roommate [21F] ruined my bday and we haven't talked since

I met this girl after she started dating my male roommate, who I've been friends with for years. We became good friends and she moved in to our house in his room after a month or two of meeting him (stupid, I know). This happened in the winter.
I had a birthday party at the house a few months ago. Everything was perfect and we were all having fun. All the sudden we realized she was missing and wasn't replying to any texts or calls. We all got worried when we realized her/his door was locked (and he was in the living room with us) and she wasn't answering. We thought she had taken something and was in trouble.
My friends knocked the door down to find her, naked with a guy, in her boyfriends bed (and technically room) as my party was going on. All of my friends are best friends with her BF (we've all been friends for YEARS and she met all of us through him). Obviously this caused a lot of drama at my birthday because the guy she slept with was also a "friend" of her BF and my friends.
They ended up kicking him out and the rest of the night was ruined because of this. Everyone left and the only thing anyone talked about the rest of the night was her. It was an awful birthday.
She texted me and apologized a few days later (we hadn't talked since that night). I told her that I would talk to her when I was ready but I needed a few days to process everything that happened.
The main reason this upset me wasn't because I'm an attention diva and needed the whole night focused on me, but because ever since they started dating, all I ever talked about with anyone was their relationship. They had a very rocky relationship so she was CONSTANTLY talking to me and complaining about it. She would sit in my room as I was doing other things and whine. When we were at work together, all she talked about was her relationship. All I ever ****ing heard was **** about their relationship and trying to give advice. I felt like I was in their relationship with how much she told me about it and how much I was constantly listening to either of them whine about the other.
I wanted ONE NIGHT where I didn't have to deal with their drama or relationship. And of course, that is what the entire night turned into.
I haven't talked to her since. It's been about two months. It's gone on so long that I don't even know what to say anymore.
She is still living at the house. Her (ex?) BF is staying somewhere else until she "finds a place". She stays in her room so I never see her.
The issue is, she didn't have any friends before meeting us and our friends. So I think she loved meeting me and becoming friends and being immersed in a great group of friends since she didn't have that before. But now she is still trying to hang out with all my friends. Half of the group hates her because of what she did to our close friend. The other half had left the party before it happened and don't really care what she did, so they are chill with her. She's been latching onto them and going to hang out and go out and stuff on nights where I don't hang out with them. I guess she's even trying to come on a trip that I have planned with them in a month (which I am not okay with).
I was hoping after all that **** happened that she would move out and find other people to hang out with. But she is still living in my house and apparently trying to be friends with my friends, so I'm not sure what to do. Should I reach out to her and make amends? Or just keep ignoring her and hope she is out of the picture soon?
TL;DR- my friend/roommate ruined my birthday party a few months ago by sleeping with a guy in the middle of the party in her and her BFs room (who I'm good friends with). We haven't talked since because I was/am upset she caused so much drama on my birthday. She is latching on to my friends (she doesn't have her own friends) and I need to decide to make amends or continue to ignore her and hope she moves out soon.


Source.

Sounds "MTV Teen Mom" style trashy....