Unfortunately, there is no law against an employer being verbally abusive as a general matter: an employer may be rude, crude, insulting, disrespectful, and unprofessional; and an employer may insult or belittle staff at will. The only exception is that such abuse cannot be directed at a person due her race, sex, religion, age over 40, disability, or similar category specifically protected by law. If it is, she may have a employment discrimination claim, and could contact her state's equal/civil rights agency, or speak with an attorney about the possibility of a lawsuit.