Forum:Mitchelle Snape?

Is there a real character in HP series with a name like that? I just heard her. She is said to be Snape's adopted daughter from the Muggle's World wayback from the year 1990 making her at the age of 10,Snape never let her learn magic in Hogwarts or any other Schools from the Wizarding World, but Sev enrolled her at a pagan academy still located at Muggle's World.Then, she had been a Death Eater at the age of 15 because Sev introduce her to Voldy as a Lost girl at the Wizarding World.Mitch and Sev hide their relationship except for Albus.But mitchelle is not a bad girl, she's a spy of albus like his Father,then,she had accompanied the trio at the book seven but when I read the book, i don't find anything.I'm just wandering ...is she true? --Giulliven