So even though there hasn't been vomiting or diarrea, and her behavior is pretty normal other than being weak (still plays a little bit and grooms a little) chances are very good that it is Lymphoma?
I have not wanted to put her through a biopsy since she is weak and becomes very aggressive during trips to the Vet. Having a definate diagnosis of cancer doesn't cure the problem, but what if it isn't cancer. Any reasonable chance it may not be that? Also I realize the baby food is low in calories and won't help her to gain weight. Am I just postponing the inevitable?