Where am I?

(F/N) (L/N) is her generations avatar. The avatar, a bender who is able to master all four elements- earth, water, fire, and air. As the avatar, she is expected to be flawless and, in her parents eyes, master the elements as quickly and efficiently as possible. What happens when one day she comes across a new bending scroll, one that has never been opened before, and is transported to an entirely new dimension?