Sara is Hispanic. Unfortunately this caused her to be the target of a lot of bullying because she was different, catcalls of "stupid," and "freak," were common place for her unfortunately. She would come home in tears everyday while her younger brother observed with a rage. Unbeknownst to her he went to her biggest bully and beat the living daylights out of him. Upon finding out she didn't know how to react, she didn't like that her little brother had to stand up for her, on the other the bullies wouldn't mess with her or her baby sister Juliana ever again. She chose the middle road and didn't react to it.
When she received her letter to Hogwarts she was overjoyed. She was placed in Slytherin and fit in right away. She didn't however make many friends due to people being put off by her coldness. The bullying didn't happen at Hogwarts thankfully. Due to her isolation and few friends she red a lot and became very smart. Her best subject is DADA followed closely by Charms. She's not so good at History, and is alright at the rest of them. She has no idea what to do with her life after leaving Hogwarts.
She tried teaching for awhile but that didn't feel quite right. She had always been good at quidditch and her classmates encouraged her to go professional. So after leaving teaching she trained hard for the next year before trying out for the Holyhead Harpies. She got the position, once she found out she was overjoyed and excited to begin the next part of her life.