She can tell he's fishing for compliments, but she doesn't mind. Good behavior should be praised, and from what (admittedly little) she knows about Peter, this seems like unusually good behavior. He hasn't even sworn at her in at least a minute.

"Of course you could," she says, slowly lifting him back into the air once she's sure of his grip. "Flying's never easy the first time you try it, and you did very well. Honestly, you're a natural at it."

Is she laying it on too thick? Quite possibly.