The Sister of the Elrics (Fullmetal Alchemist Brotherhood fan fic)

Hi! I know there is a similar fanfic in wattpad, but this story was made inside my head a long time ago. Also, I do not own Fullmetal Alchemist, and this is my first time writing, so reveiws would be awsome!!!
Risa one day appeared on the street near the house of the Elrics, without her memories. The Elrics welcomed her, and Risa was happy about getting to be a part of the Elrics. But one day, Trisha Elric dies, which begins the long, terrible story.

Risa Elric (Hawkeye) -
She was found on a street without her memories. She has a long brownish hair, which she ties it into twin tails. She also has amber eyes, and she is higher than Ed, but lower than Winry in height. She uses her boots when she is in battle, covering it with electricity with alchemy.