Kara was going to say she had absolutely no idea what it was to bend fire. Could fire be bent? But then he showed her. She looked surprised for a moment as she watched it vanish just as quickly as it came. After a moment she smiled. "Well, I've never heard of such a thing occurring on Earth, but there seems to be a lot of things here I was unaware of." her training before coming here really hadn't covered anything she had been experiencing. There was no point in being annoyed about that now, there was nothings she could do about it.
Did she honestly have to call him Prince Zuko? He wasn't her prince. He was a prince where he came from, she was a member of one of the nobel houses that was part of the ruling body on her planet. Not quite the same thing, but as dysfunctional as her family had been, it had held power to its name. She might have made some comment about how calling him 'Prince' wasn't going to happen, but Clark's voice about manners was ringing in her head. "Yeah, there seems to be a lot of people not from around here." which would cover why she had never learned about it in training. "It's nice to meet you, Prince Zuko. I'm Kara Zor-El, and I'm a Kryptonian. From another planet, that is, galaxies away from here." At least she had meant to come to earth, though she wasn't quite sure he had meant to.
She certainly couldn't bend fire, though she could start it with her eyes. Nothing like that though. It really was refreshing, it seemed like she probably wasn't going to have to hide who she was here, which was fine with her.