She can benefit from working with a therapist (counselor/psychologist) who specializes in treating anxiety spectrum disorders.
Another form of treatment would be to work with a speech pathologist.
There is also medication that can to an extent regulate her anxiety level. Natural options are also available for anxiety. It may be most helpful to use a multidisciplinary treatment approach.
Behavioral therapy, counseling, play/narrative therapy and working with school personnel can all be incorporated in her treatment.
It would be helpful if there is a counselor who could work with her at home and at school.
Please feel free to clarify if this is what you were inquiring about.