What should I do?

La

My pup is not quite a year old yet. Her brother and the other dogs are picking on her. She is scared of them because of it and they make her bleed. I feel like this stresses her out and she is pulling her hair out plus she is allergic to the food. We are buy her special soap for baths since her skin is all torn up from the allergies and them picking on her. What can i do to get them to stop picking on her?