it’s a dead end unfortunately. We’ve all been there.
First of all, don’t press her, it won’t do you any good. She’ll just go away. And hate you too.
Secondly, even if you do manage to get a relationship out of this, it is certain that it will be a short one, which apparently is not what you want. You might get a one-night-stand, but that’s just about it. The last time this happened to me I managed to hold it together for almost a month, and I think that’s a world record. Right now she’s just looking for someone to get revenge from, some rebound relationship, something non-commital. Regardless of what she’s like, it is 100% certain that the relationship that follows a long-term one is ALWAYS short and insignificant. So is that what you want?
Thirdly, if you really want her you should let her have that short-lived relationship with someone else first, let her get it out of her system but also keep a close eye on her and let her know your feelings. This is very risky, because after that guy she’ll probably just move onto the next one, and there’s no guarantees that it will be you. But at least you have a 1% chance, as opposed to 0% if you do it now. And it will also be more painful than it sounds, if you really love her, to see her with this new guy instead of yourself. Nobody is that strong.
Finally, my suggestion: be her friend. You cannot have this girl. But be her friend, be there for her, be patient if you can. I think it will be the least painful. Maybe over time you’ll realise she’s not for you, or in a couple of years she’ll realise how wonderful you were to her and then give you your chance. It’s the only thing that would really work, and it’s the least painful of the realistic options. I know most people will tell you to forget her, but I also know you won’t.
I feel your pain my friend. Be patient.