It's difficult to give specific answers, it depends so much on the other person as well. Why don't you just call her and see what happens and what she says?
For example,I'll call someone maybe even two/three days/a week after I've met them if I think something I'm doing might interest them (movies/concerts).
I'd say something like ''I'm going to this theatre play so I thought you might join me if you have some time, we can meet for a coffee before that.''
Or ''I'll be around town tomorrow so if you're free for a coffee let me know''.
I know that work and family take up a lot of time so it's difficult to meet with some people, then I usually call them, send an sms or email when I feel like it, which is often
It's nothing too long, just to see how they're doing and what's going on with them.