My husband has a bit of a stutter. He was bullied a lot and has dealt with anxiety as well.
Seek help from the school's resources. I have a friend well into their college years still stuttering. It needs to be fixed, or it will effect their relationships, communications, social skills, and employment/careers.
Speech pathologists can help
I agree, anxiety. I still stutter very much when I feel backed into a corner by someone because I have anxieties. I would make sure she isn't getting picked on in school.
Could be anxiety. Does she do it in all locations or only in certain places like home or school?