That's very true. Also Metal bending, she's in a metal crate and can't see or attack. I remember how it was 4 episodes into the show before we saw our first Earthbender, and it was one of the most powerful characters in the show flatout, he threw the WALL and WON. So when we next see an earthbender about four episodes later we don't really get why he's struggling to move one rock through the air. Compare that to the constant showcase of firebending and rudimentary water bending and master Airbending (Making it 6 seasons of the show before we ever saw an airbender who couldn't singehandedly take out ten elite guards even by age 7.