No but it’s alluded to. Saskia says that therapists have used extreme words to describe what happened to her, but she had never related to them before being back at the school.
Saskia was groomed by a teacher and “in a relationship” for her final year of school
More ambiguous, Amelia dated and ultimately married the groundskeeper at their school. He’s stated as being 19 but it’s never 100% what age she was when they dated
Sort of. One character was revealed to have been groomed as a teen and being in the same place as where that happened and the pressure of leading causes her to regress into a bullying persona.
However it is stated she was in a “relationship” with her teacher year 12 and had been a bitch before that, so her original bullying tendencies aren’t necessarily wholly from the abuse.