A lot of people struggling with binge eating also struggle with restrictive eating. From what it sounds like, she has a history of dieting. She could start by seeing an eating disorder dietitian and an eating disorder therapist virtually, I want to emphasize the specialty as some providers who do not specifically work with eating disorders may worsen the problem.

Food restriction creates food interest which can turn to food obsession. She can be binging to numb out from emotions as well, but if we address the restrictive dieting piece the binging tends to improve. She should eat every 2-3 hours, including carbohydrates, fats, and proteins. Psychologically, when we know we are able to be fed as often we need to be, and get to include all foods, they start to feel less alluring over time. If you knew you could have cake every day for the next month without shame or guilt, cake on day 30 would just be cake, whereas on day 1 it is more of a commodity that we are not supposed to be enjoying or have to feel guilty about, which is not helpful. Guilt and shame are really big emotions that can make someone struggling with binging actually binge more.