In the series, yes, she has sex with Caleb.. then she finds out that Caleb was spying on her for Jenna. But she doesn't listen when Caleb tells her that he didn't actually tell Jenna anything because he liked Hanna too much (loved her actually) and he didn't think that Hanna was who Jenna thought she was.
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According to the book it was because he was in some virginity group and Hanna was pressuring Sean to have sex with her at Noel Kahns party.
No, A ran over Hanna
At one point, Mona was A on Pretty Little Liars. Now she is helping the girls figure out who A really was. She was A because she couldn't get tortured, if she was apart of them.
Kate has an STD.
hasn't happened yet