I don't know about her, but you're certainly pissing everyone else off with your constant threads about this one girl. You sound obsessive and more than a bit stalkerish. Leave her alone and find someone more your own age.
Her sexual history is none of your concern. You're not even going out with her, and even if you were in an exclusive relationship, her sexual history would still be none of your concern. It's the past, the past can't be changed.
You remind me of Angel Clare in Hardy's novel Tess of the d'Urbervilles.
He creates this idealised fiction about Tess, and when she can't live up to it by not being a virgin he pretty much destroys her.
That's what you'll do to this girl. Get some therapy or something because you're really creepy.