What is her problem?, girls only please?(friend zone/possible friend zone escape related)?

ok so me and this girl have been talking for almost a year, she has trapped me in the hell hole commonly known as "the friend zone", after a while it got to the point where she started thinking of me as a brother, which we all know is the "kiss of death", but about a week ago we were talking on the phone, for 5 hours straight, at first we talked about the typical friend stuff, how you been, what you up to, etc.after about 2 hours of those types of casual conversations she tells me secrets about herself, sex related but i wont go into detail, after we spent like a half hour talking about the secrets we start sharing fantasies and fetish related ideas with each other, which we had a lot in common, that lead us to have phone sex for the next 2 and a half hours. before we stopped talking and went to sleep she says we cant exactly think of each other as siblings anymore, though she was the only one who did in the first place, now a week has passed and shes back to calling me "brother" again as if shes in denial about what happened last thursday night. I think me and her need to talk this over rationally of course, but her denial is making it difficult. any suggestions about what I should do because I know for a fact that if me and her were to date, we would be a perfect match, seriously we have a lot more in common then sex stuff and we always enjoy hanging out with each other and I really do care a lot about her, even a few of her friends think me and her would be a great couple, so what should I do?