Quarentined with my trigger

My oldest sister has made fun of me and my weight my entire life. Now, whenever she comes home she goes on fad diets and flaunts in front of me. I have a mixture between anorexia and bulemia meaning that if I ate more than six hundred or so calories in a day I would force myself to throw up. I'm still very self conscious, but I am trying to recover and have finally begun eating full meals without shaming myself. She is back and stuck in the house with me. She asks me to exercise with her all the time, but I declined and she shamed me telling me how lazy I was and that I was going to get fat. That hurt because I have gained weight by switching to healthy eating habits. Later, I had a snack of a burrito with salsaa she came down and saw the empty plate. She asked me what I had eaten numerous times, and I refused to tell her. After the third time, I told her I don't want to discuss my eating or exercise habits with her and she called me a brat and a bunch of other mean names. Later she was watching me from the hall and I wiped my nose and she laughed and said I was digging for gold and that was what I had been eating, which she knows bothers me because I picked my nose as a child and she made fun of me so relentlessly I stopped. I don't know what to do. I'm stuck with her in the same house for who knows how long and I've purged every day since she returned. I don't know how to live with her and love myself at the same time. She doesn't even know about the eating disorder. Any ideas?