Dude, you might honestly have something more than a good ticklee. This could bud in to a beautiful friendship. Don't get so focused on the tickling that you miss the opportunity. She might still like you, like you were saying in your first post. Or she might have moved on in her mind. If you feel like a relationship with her is still possible, do all you can to focus on relationship instead of her as ticklee.
I've messed up a few times being too narrow-minded/tunnel vision on tickling fantasies, and missed a few really great girls that could have been more (including better fantasies down the road). Just hoping that I'm helping and not confusing the situation. Have a good one.