Just pick up the phone and call her.
Just say...
Hi, <girls name here>
It is <your name here>, we met a couple months ago and I just thought I would give you a call and see how you have been.
From there it should open up all kinds of stuff. If she says she has been good, great, fine, super, things couldn't be better, etc. It doesn't matter what she says. Just start asking her questions about her. The more questions you ask the more she will tell you and the more questions you will be able to ask her. Trust me dude you probably won't even have to say much other than ask the questions.
I would say just give it a shot... Remember... Nothing Ventured... Something lost!
Go get her!