I wouldn't go with what the other poster said.
If this girl is "truly shy" or just purely inexperienced you don't want to back her into a corner like that. I think what you have to do is have patience. Eventually you guys will get used to each others habits and the silly things she does now won't be around later.
Just chill man; its only the 3rd date; you're acting like this has been going on for a month.
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