My son's ball python has not eaten for 4 weeks. She usually eats one adult mouse (frozen) once a week. She has never done this before. She shed about 4 weeks ago, so when she first refused I thought it was because she was going to shed. She shed about 3 weeks ago. Her skin is starting to look dull again. Can she be shedding again, that close together? She is 16 months old.