I think the Answer Girl took the form she did because it makes for good eye candy. Girl was seriously hot.

House: Wilson is gonna hate me.
Amber: You kind of deserve it.
House: He's my best friend.
Amber: I know. What now?
House: I stay here with you.
Amber: Get off the bus.
House: I can't.
Amber: Why not?
House: Because... because it doesn't hurt here. I don't want to be in pain. I don't want to be miserable. And I don't want him to hate me.