Man don't be a pussy, she obviously has the hots for you, just handle it like a man. All that 'dont wanna ruin a friendship' is weak shit, don't fall into that trap. Coz if you don't jump on her immediately she will class you as 'only a friend' and you'll be a shoulder to cry on while some other dude fucks the shit out of her. I'm talking from experience and getting screwed like that myself.
Good luck
Good luck