Most women up through their 20s take full advantage of "Friend Zone" and date people who are more "fun, exciting, dangerous" (insert something your parents hate). We "nice guys" just have to deal with that and either look for women not obsessed with this or wait it out until they mature out of this phase (though not all of them do).
Move on to someone else and completely forget about her. If SHE comes back to YOU, then you can see what happens, but as of now, that ship has sailed. The Friendzone is very real, and despite whatever BS women want to say to defend it, there are plenty of women who actively take advantage of nice guys. There are plenty of relationships that bloom from friendships too, but it's usually at the whim of the woman and whatever she happens to be feeling at the time. And usually only after a bad breakup of some jerk who treated her like crap and she matures and realizes maybe nice guys are good for long term stable relationships.
So maybe that time will come? But it's not coming right now. Find someone else, at least for the time being. Maybe you'll find someone even better, who knows. But if it happens with her, it will be on her terms and not yours.