I would leave it for now, you have asked her out and she has said no, stop hankering after her, stop being at her disposal on the hope that she may like you in return, sometimes girls like that feeling of power that they may have over someone.
If she really does like you then she will let you know, if not then you have to move on, there are plenty of fish in the sea.
at the moment it looks like she is using you as an ego boost, rise above it and start doing your own thing, she may start liking you if you are less available. (weird but true)