Like others have said here, communication is key. Just ask her why it bothers her. I would guess that either she's never kissed anyone before and is apprehensive about her first kiss, or wants it to be 'perfect' or something; or perhaps she's had an experience in the past that makes her apprehensive about kissing now. Talk it about between the two of you, and of course be respectful, let her take the time she needs. She'll come around eventually. 
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"The world is so exquisite with so much love and moral depth, that there is no reason to deceive ourselves with pretty stories for which there’s little good evidence. Far better it seems to me, in our vulnerability, is to look death in the eye and to be grateful every day for the brief but magnificent opportunity that life provides"
-Carl Sagan
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