At one point, she says, "there was no-one to turn to in the school and I felt so low I didn't want to go on".
According to research for BBC School Report, half of teenagers with mental wellbeing issues try to cope alone.
And a third said they were not confident enough to speak to a teacher.
At her lowest point, Grace made a "suicide video", which she posted on YouTube.
"I'd get beaten up every week," she says.
"Teachers wouldn't do anything. I even heard the teachers talking about me behind my back."
According to her mother, Sarah, Grace got some help through external music therapy and counselling but little support directly from her first two schools.