Mandy became close friends with Lisa Turpin and Padma Patil in her first year at Hogwarts. She thinks that Indianna Crawford is just as bizzare as Luna Lovegood, and suspects that they are distantly related. She is also terrified of Anna Yallorn, who is best friends with Indianna. She is a typical girly girl, and isn't very smart, leading to confusing people about why she was sorted in Gryffindor. In her second year of school, Mandy was taken out of Hogwarts by her parents, who were worried about her being there while the Chamber of Secrets were open, never mind the fact that she is a pureblood.
In her fourth year, when Harry Potter was chosen as a Champion for the Triwizard Tournament, she dedicated half of the year with Padma and Lisa to find out why and how he had been chosen. She went to the Yule Ball with Kevin Entwhistle, and they started dating. In 1995 she joined Dumbledore's Army, having been dragged by Lisa and Padma, Lisa having taken a peculiar liking to Ronald Weasley. The next year she became more friendlier with Indianna Crawford, much to Padma and Lisa's disgust, and she fought in the Battle of the Astronomy Tower.
Mandy convinced her parents to let her attend Hogwarts in her Seventh Year, fully aware that Lord Voldemort was still at large, then in May of 1998 she fought in the Battle of Hogwarts, where her friend Padma was killed.