A. You're describing what we call bilaterally symmetrical truncal alopecia, which in a cat can be due to quite a few things. External parasites, like mange and fleas are a possibility. I know you said she doesn't go outside, but consider these if you have other pets in the house. Food allergies also come to mind, and if she were my patient I would try a hypoallergenic diet for no less than 6 weeks. I would also run full blood work and a urinalysis to rule out underlying hormonal problems (especially with the weight loss).
Sorry, I know that's a lot, but these are kind of tough. I would start with the blood work and if that's normal I'd likely try the diet trial. And consider that this could also be a behavioral problem - cats chew their hair out of boredom or stress - and she may need medication for that.
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