"Didn't your mama tell you that if you kept on scowling your face would freeze like that?"

He'd be absolutely gorgeous if he wasn't sneering so much. Lydia doesn't seem to expect a positive response to her banter, and she's prepared to move on quickly if he offers her so much of a sneer. She does feel compelled to note, though, "You know, this place isn't really the suck you seem to think it is. Give it a chance."

It's not that she can read his mind. At least not in the genuinely telepathic sense.