Yep, what Psyber said.
If you leave it a week, she'll think you're not interested and chances are she might have found someone who IS, but if you ring the next day she'll think you're a stalker. I speak from experience. Women are bloody hard to work out.
I met a bloke once when I was in Melbourne and we got along really well. It might even have worked out - there was certainly interest on both sides - but the day after I flew back to Adelaide, he DROVE from Melbourne and turned up at my work with flowers. That is a seriously awesome thing to do
at most any other time. However, I was still working out my feelings - I'd just come out of a horror relationship with a rather violent and stupid person - and this was too full-on for me. To be honest, I felt a bit like a rabbit down a dead-end hole with someone poking a stick at it. Whereas if he'd left it a bit longer, my attitude might have been very different.