[When she appears in the dream, it's real enough for her that she doesn't quite realize that it's a dream -- instead, she's focused entirely on getting to that car and trying to get it open and to the people inside. She's airbending to try to get air bubbles around their heads even through the windows, and unable to]
[She's also trying to yank the door open and not quite managing it, getting frustrated easily and feeling like her movements are sluggish and slow, thanks to the dream-like quality of everything]