Q: " What do you think's behind..."

Question: " What do you think is behind Charlotte's rude behavior? After all, she's been nothing but a jerk these last couple of days..."

I think what's behind Charlotte's behaviour is that she has a secret. And those awful little things can do some remarkable things to a person.  So she takes it out on Lacey. But don't worry, she'll get her payback sooner or later.