The Winchester's life changing story

Abi sells her soul to Lucifer, The devil himself. He gives the young Winchester a year. She only sold her soul for her older brother Dean's life. He was dying in the hospital after being hit with a semi. it was the only way she could think of to save her brother from death, to save him from hell.

The young Winchester goes to hell and is tortured for many years. After the years have passed she finds herself back on earth walking among humans and the things that to go bump in the night. something isn't right about the young Winchester. she no longer wants to hunt the things that go bump in the night. she wants to hunt her brothers. But why? here's the answer she's a Demon and she believes there's no way of saving her it's way too late.

Is there a cure for the young Winchester? Is there a way to save her before she kills her brothers? Read and find out.