When I'm in a new or uncomfortable situation like this, I assume the best of everyone involved.
It relieves me from worrying overmuch about what's going on with other people. It also helps me be more receptive to what people are actually saying (as opposed to what my brain thinks they are saying).
So I would personally assume in this situation that she just wants to get to know you better. And maybe 'better' has a sexual component, maybe not.
I've found that most people reveal pretty quickly with words or actions or both what their agenda is. And if their agenda is not in your best interest, that comes out as well. Counterintuitively, assuming the best of people allows me to see someone for who they really are.
And, yes, asking what she wants is a good idea too.