Well...I don't know much about the backstory here, but I will do my best.

I think it could be beneficial to you and her to try the friendship thing for awhile, but tell her, in sincerity, that you still have feelings for her, and that you hope you can prove yourself worthy of her (or something along those lines...I'll leave the wording to you). But don't try to force her...I don't think that ever really works in the long run. Work on your basis as a friend before you try again as a lover.

Things might be awkward for awhile. They usually are after a breakup. That is okay, and very normal. Just be you. Try to remember (and to an extent, make her remember, though again, you cannot force her heart) what brought you together in the first place.

I hope I was of some help to you. I wish you my best.