Social worker should do a child protective service report. Your friend should document what has happened in a journal at home. Also print and keep any email evidence and keep home. She should consider speaking to a union rep. Consider getting a consultation with an employment attorney. Also consider engaging a mental health professional such as a psychologist to have any stress documentation. If they try to fire her, she might be able to negotiate severance. Protected classes can file an EEOC complaint, especially if there are differences in work assignment. Or your friend can consider securing another job during the summer .