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First off recognize your dynamic with this girl.
If you guys are well into a comfortable stage without attraction, you are in the friendzone. It is a bad situation simply because she has already looked at you in a friend light and you yourself has disqualified yourself literally by interacting with her without building any sexual tension.
Technically you can get out but honestly you'd have to work even more and your success rate is lower than you would if you just found a new girl and start from scratch.
Inner game wise, this would just feed into a one-itis situation and unrealistic value placement on one girl.

I have to agree with my friend Justincredible here. It is much easier to start over doing the steps we know work than trying to change her mind.
She has all these thoughts and interactions with or around you as a friend. That is how she views you, and your relationship. To change these perceptions in a short time is very difficult and rarely works. Then of course you're going to risk the "friendship" by escalating to maker her your girl or you won't be pushing hard enough. Keep her as a friend.
Sorry buddy. Oneitis is a trap just because of this reason.