I am interested in a cat that was surrendered a few weeks ago by an owner that has been diagnosed with a terminal illness. She is a 10yr old Siamese mix. She developed a URI and was not eating very well.. Her blood sugar was in the low to mid 300's. She was treated for the URI and has been eating Purina DM wet and dry food for the last two weeks. The vet cleared her for adoption, her blood sugar is now in the low 200's and got over the URI flare up. She has gone from 5lbs to 7lbs. If I continue her current diet should I be concerned for her well being? Thank you in advance.