"Shouldn't it be really obvious once you get powers? I thought you'd be able to tell immediately."

She gives up on the doe eyes pretty quickly once he actually turns to her and she sees that it's going to have little to no effect. Beside that, her genuine reaction of surprise at his explanation takes precedence over trying to goad him into letting her learn magic without "actually having powers."

"My Earth didn't have magic, so I guess I was imagining it'd be this huge monumental feeling. Maybe that sounds dumb to someone like you who's used to knowing it."