"...You don't know the League? Group of heroes dedicated to protecting the Earth?" This is getting more and more bizarre by the second. Unless of course-

"Maybe...Maybe we're not from the same Earth?" Though she doesn't sound thrilled to reach that conclusion. The idea of meeting another Kryptonian...Well, that sounded really thrilling; someone different from Superman, but maybe with some common ground with a certain Superboy. It's distressing to consider that she isn't from M'gann's own Earth, even if that explains a bit.