Tori got beaten up sometimes before she started hanging out with Iris.

Iris scares other kids more than Tori does, and they get freaked out by the fact that her eye opens up to a little mouth, so they avoid her. Tori tries to insert herself into situations where she tries to make friends and find acceptance with other kids. Since she doesn’t come off as threatening this way, she gets rejected/ejected from their groups more often than not.