Ellie is Mandy's cousin and appears in Facing the Demon Headmaster.

She is what is known as a First Purple, which means she was there the night that Club Purple opened. We find out later that she is hypnotised and working for the Headmaster like the other First Purples and was the person who guided Dinah to the website with the edited picture of Phil Ashby whose real picture has been replaced with a picture of Dinah's real father.