OP... I should let you know this because it reminds me of some relationships I've had before. Girls like her don't want you to try to show affection, most of them will eventually say you are needy. Try not to exaggerate in asking for afection feedback and stuff like that.

Basicly, do nothing. Not only that but, stop paying her atenttion, she will eventualy gather the strength to talk to you about it.