It helps if you talk to your kid. I think it will be better if you tell him that no matter what happens, wag niya papatulan yung bully. And also, try to talk to your kid's teacher. That way, the teacher will be aware of what's happening around her and she can take hold of the situation. Bullying is a school offense and this should also be relayed to school staff aside from us, parents.
Magbasa pa