Her skin would grow pale...then scaled...her hair falling out of her head in chunks till her flesh began to shape itself into long tubes...that eventually would grow teeth. As the Amazon Katara would be transformed into a Ghastly-White Gorgon.
The Amazons would quickly find her as the God would quickly disappear. As despite her cries for help and pleading the women knew there was nothing that could be done. One of their daughters had angered the gods...and now they were outcast. Katara getting to hug her mother one last time, before she was banished to the woods.
Alone, Inhuman, and afraid. Katara would have no one, and nothing left to her name. As she would walk through the forests alone and discarded by the rest of her tribe. As one would be with her during this time: The Goddess Athena. Taking pity on the poor girl's situation she would appear before Katara. Guiding her to safety and civilization and promising her that she will aid in the breaking of this curse.
As now Katara wanders the Modern Age. Learning how to be a hero alongside dealing with her past and the loss of her people. Keeping it within her heart that maybe. Just one day
She could return to them.