This is a long shot and maybe depend on the school and teacher but could you talk to them about it and see if they would talk to her? I am a teacher and am unsure how this approach would go down as well to be honest but I think as you said it is really important that someone says something and asap.
I think you would be completely compassionate and understanding in the way you approach it with her knowing that you have been through it yourself

but how she takes it is anyones guess. She might initally be in shock and avoid you initially but then be very thankful later. I would be inclined to talk to her about it.
ETA: THe more I think about it the more I think talking to the school may not work

Tricky one.
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