The Secret Cat

Tabitha, also known as Taby, or Cat depending on who you ask, went through Hogwarts relatively unnoticed. She studied hard, and worked her way to the top, academically of course, but at the expense of a social life, and sleep most nights. Most often though, people would confuse her for her twin. Well they WOULD. As in past tense.
When her sister passed on, no one noticed except for Lily Evans someone Cat depicted as a close classmate. And the only one to really know Cat’s secret. You see Cat is a metamorphmagus. But not your average metamorphmagus, Cat is a ani-metamorphmagus, meaning she can change her appearance to be that of an animal’s or obtain any animal she’s encountered abilities. Like the hearing of a bat, smell of a dog, or the body form of a cat. Hence the name cat. Though that's not to say that she doesn't have the abilities of a regular metamorphmagus.
Then everything went wrong.They never noticed her in school. They never noticed when her family was murdered. No one noticed when she disappeared. Except for one person.