The Last Horcrux

This is a story of another secret twin sister of Harry Potter, but a little different. This girl Allie Evansine has been raised by three different dads, but she only knows about one. She also had unexpected friends in the past she doesn't know of. Also she has a mark. Just as Harry. Only she has a skar on her chest right above the heart. Just a little scar. Shaped like the Elder Wand. She only figures it out around her teenage years by entering Snapes mind and sees his memories. Why this all happened? Obliviate.

I would like to bring into your attention that english is not my first language, and that you might notice at the first few chapters that I write a lot of boring details, but don't worry im not going to rewrite the whole series of the books. After a few chapters i will focus more on Allies lore.

Also you can use this as an OC reader story. A few info about her:
Allie Evansine has dark brown hair with a slight ginger lighting. Brown eyes and a bit tanned skin. Not too short but not tall. Proud Griffyndor. She likes to hang out with Seamous, Dean, Neville, the Weasley twins but her best friends are Harry, Ron and Hermione, and she has a brown cat called Winnie.