May I suggest you just ask her out (as a friend) to do something a bit different, fun, exciting, maybe a little dangerous or scary. Not sure where you live or what you're into, or what's available, but I'm sure you can think of something.
If you come up with something like I described, you may just respark up your relationship, have something new to talk about and have plenty of opportunity to kino.
If you can do it in an off hand sort of way, you know, I fancy trying this, you wanna come? or I'm doing x with some frineds, fancy joining us? ask in a non committal sort of a way so if she says no I'm busy, you can ask her out another time in the same way. (Make you you do the thing whether she comes with you or not, then tell her how much fun it was!
Anyway hope this helps. Good luck.