Avatar In Naruto

She comes from the earth kingdom where the counsel found that she was the next avatar.

But the world was in peace so there was no need for an avatar.

She still got trained in all elements and extra bending skills.

She became a great fighter due to her rich family.

At the age of fourteen she was complete in avatar training except fighting in avatar state though she could enter the spirit world just fine.

Due to finding a forbidden scroll she disappeared into the naruto world where she is stick in a five year old body and gives the ninjas a run for their money.