Is your OC a Mary sue?

Kitten- creepypasta Oc.

Name: Lucy Katrina james.
Age: 16
Story: her family was poor, so they were always at work, causing her to basically raise herself, as well as her little brother. When she went into high school, she went into the group of bad kids and started dating a bad boy. She caught him cheating on her. A few days later, her old friends started to beat her and her ten year old little brother badly, resulting in her little brother dying when she was half way to the hospital with him. This mix of tragedy caused her to go insane and kill her old friends.
Catchphrase: I'm not human.
Creator: swag4girls

Commentary: Her story seems to be a mix of Ticci Toby's and clockworks, although there were some unique differences. Her design is Mary sueish, as well as her cp name, Because her story has nothing to do with cats.
Mainly the design strikes me as unoriginal because of her mask, which is very unoriginal. She just needs some tweaking, mainly her on her appearance. She is pretty cool, she has potential! Please don't be let down by this.

Mary sue level: 80% Mary sue.