Let me try and put a different perspective on this.
Out of all the people in the bar, she chose YOU! You are the one she felt attracted to, you are the one she desired so much and trusted that she decided to take you back to her apartment and have sex with you. The way I see it, you must have a lot of great things going for you for her to have wanted you so much.
Hey, I understand that you may feel rejected - but actually, you were never rejected because in her mind it was never going to be anything more than sex. At most I would put it down to a misunderstanding. She certainly won't view it as a rejection, so you shouldn't either.
You both had great sex together, now it's time to move on and delete her number.