She can't believe you're also Kryptonian! Clark introduced you to her not too long ago, now she is finally able to teach you how to properly control and use your powers!

"Flight is one of our strongest abilities, but you have to be careful to not fly around people. You shouldn't expose your true identity to the public." Kara warned you as she wore her formal blue Supergirl suit.

You crash landed on earth a while ago, you're barely entering your adult years. Kara understood the struggles.