<human>: Can you condense the text into a few key points?

I'm 21, male. So there is that girl from college. She's a friend of my buddie's ex. This whole semester she always said "Hi" even though we didn't know each other, being friendly I always replied and smiled. The other day she started talking to me in the subway, for the first time. Last week she added me as a friend on Facebook and started messaging me the next day. We exchanged a couple messages wish misc. contents, in her last one she asked if I'd hang out with her, "maybe with Tim or somthing (name changed)". I told her that I'd like to and gave her my number. She said something like "Perfect, I'll hit you up!", she is out of town right now and I assume she meant she will come back at me when she's back. This has been a week ago now and I haven't heard from her yet.

I know Tim, he went out with her once but he assured me she didn't really like him.

What does that girl's behavior mean? How am I supposed to act? Wait until she contacts me again? I have never seen a girl acting that "agressive" towards me, but I like her and would like to meet her. On the other hand I don't want to appear "needy".

Thank you!
<bot>: Girl from college initiates contact with me, said she'd hit me up, but I haven't heard from her yet. What does that mean?