It can take a chicken anywhere from a couple weeks to a couple months to finish the molt. Sometimes hens don't complete their molting process entirely while others only molt in certain places. Make sure she has protein since feathers take up 85% protein. Meat scrapes, eggs, oatmeal and quinoa are all great foods to feed during the molt. If the others are picking on her and causing her to bleed, you need to isolate her immediately as this will only cause more issues. If she isn't bleeding but still being pecked on, maybe look into a saddle or some other covering to put on her body to help protect it.
Hope this helps and good luck!