<human>: Can you provide a brief overview of the text?

So on Saturday night I was at a party and got talking to this pretty girl. She was lovely and we must have spent about 3 hours talking to each other about loads of common interests.  

We pretty much decided to leave at the same time and she asked if I would walk her home as there are lots of dark/empty streets etc. So of course, like any gentleman, I walked her home. Because we'd been talking so long in the evening I was half expecting her to invite me in to stay the night etc, although wasn't too upset when she didn't as not really up for the whole ONS thing.

So got to her door and left without a hug or anything, it was a little awkward although I'm not sure in what way. We're now friends on Facebook, and have exchanged a couple of messages.

I'd really like to meet up with her again for a drink or something, even if it's just to be friends and not any further. But I'm not sure how long to leave this/what to say. Or even if asking her out for a drink is a little cliche?
<bot>: There's a girl who I met at a party; when is a good time to ask her out to do something and what should I say?