WoW... a woman who's comfortable with herself. You should get a Nobel prize in psychological studies for a finding like that. Mate, beleive it... she might seem she's comfortable with herself, but that's far from reality. She probably has the stupidest insecurities of all.
Once I met a girl, who seemed super confident. I even thought she was too much for me so I didn't make a move. Turned out she was afraid of shopping alone because she thought people would think she's some issues.
And this is not a unique stuff... Girls have all kinds of fears about what people think about them 24/7.
If she's really a party girl, she must have many things going on her life. I've already given you examples on what to talk about...but if it's not enough I'll give you something else. Basically I could write here anything because women were made to talk. I can't imagine a single topic that I wouldn't be able to discuss with most of the women I know. But I can feel where you're coming from because I used to be there too... so...examples.
-talking about the wildest and crazyiest things she had during the time you haven't talked.
-talking about passions.
-talking about the best vacation ever.
-talking about dreams.
Or if you have a big mouth... "So... you must have been up to many things lately. Found the meaning of life yet?"
^This is good because no matter her answer, you have the conversation. You can just make it go wherever you want it to.
Say... she says "Haha no..." I'd be like "Oh...then what about cookies? I love cookies"
Just keep the whole thing fun. Be abstract, and creative and try moving the conversation to get meet-ups asap. (Like suggesting to grab some cookies some other day
)