I have BDD and anorexia. I’m 87 pounds and only 5 feet. There is really nothing you can do except trying to get her help. What helped me personally was going to the doctor and seeing on a piece a paper the too thin/normal/fat/obese weights and sizes. For my size I am supposed to be around 102. I’m 87 now from 83. What makes it harder for me though is I refused medication and I quit going to treatment centers. I have as I call them “mini-relapses”. I will start to catch myself falling back into old patterns from time to time (ie: spitting out chewed up food and eating just water, Take5 bars and a bag of hot fries). When I catch this behavior, I fix it quickly, even though it makes me depressed. All I can say is that it’s something your friend needs to decided on her own. She can either kill herself from BDD or get better. It’s all up to her.