The entire premise is, Toph had her feet broken and bound like a proper Earth lady at a young age and therefore has to learn a wholly different kind of earth bending. But then again, Toph is a bending prodigy, so she learns to work with that (it's not like she has a choice in that regard).
The OC is believable and well characterized, which is always good if you go for OCs, so... yeah.
I enjoyed it, since it showed a (possible or probable?) side of the universe hitherto unexplored.