How to ask this girl out help please?

[Joe]

Okay this girl I met on this church trip a couple years ago when I was a sophomore (now I'm a junior) and I talked to her a good bit and also she was bit shy but I got her to open up a little but back to the point I haven't seen this girl in while and I recently followed her on twitter and he followed me back and she always tweets about "anyone want to hang out I'm free this weekend " and I really want to get back in touch with her but idk how to put this into simple words but asking her to hang out with out makin akward? I really don't know what to say when she tweets about something like that because I really want to say something and btw I lost her number a Long time ago