Ok ok ok ... this sounds very familiar. Idk exactly the kind of girl she is but i can tell you what i learned by experience. I was dealing with this HB9 last year and she was the most sociable girl i have met yet! Anywhere she would go she would interact with EVERY1, guys, girls, EVERY1. I first thought it was a shit test, then i noticed it was her personality... NOW, i noticed she would tell me stuff like "i like that guy, he is cool" or she would talk with guys and take drinks from them, even phonenumbers. This is what i did, and believe me, this girl went nuts with me! Im telling you, she was crazy for me, and she could have any guy she wanted!
1- be as social as possible. If she engages in a convo with some1, try to give your imput.
2- take advantage of that to get to know new people. Even if they are guys, be friendly, show that youre not intimidated by the fact that she is talking to them!
3- Imagine she is talking with a group of guys. Take the lead and engage in a convo with one of them, or the group, and show her you dont care about what she is talking about, you can get in a social state of mind too. Usually she will do it expecting you to be hearing what she is talking with those people about and ignore you a bit. Dont fall for that. Show that you have personality, that you can get their attention too
4- Dont be afraid of leaving her alone with some1, specialy if you have some1 elso to talk with.
5- If she mentions she likes some guy, tell her she should approach him BUT make sure you do it first. Find a way of start talking with the guy.
6- I told this girl i was dealing with "you have great social skills, i like that ... i admire a person who can talk with anyone!" Basically i told her that i liked what she was doing, it wasnt affecting me at all, and i prettended that she was doing it to feed her social needs instead of making me jealous.