Why is she so nervous around me?

Why is she so nervous around me? I try talking to this girl but she seems very nervous. I'm very calm, cool, smiling and friendly toward her. She comes off as very compulsive when I'm around like acting weird. She doesn't always look me in the eye except when she talks to me. Then she'll mention stuff that I have that she doesn't like or why did I pick it. Its too bad because I really like her too. If I go over to her and just talk, she kinda just keeps carrying on...

Thanks for the answers, ultimate question(s). Should I still go see/talk to her? I normally go every day (its on the way home for work and I look at deals), or should I break up in seeing her every other day? Twice/thrice a week?

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