(GIRLS) I want to ask this girl out.. (Help)?

[shadic]

Long story short...:

Me and this girl have been talking recently, about 2 or 3 weeks.. I've asked her to hang out and she wants to but we have not yet because she's super busy..

- I've known her for 4 years, we've hung out before maybe 4 times, as a group..; she is single, we've been texting mostly plus skype, facebook, and calling..

What I need to know is.. Should I just ask her out over skype or something? Cause we haven't hung out yet, and have been talking for a while.. What should I do? Should I try flirting with her, just wait till in person, or what?

How would you feel ladies, What can and should I do?

Thanks, il answer yours..