When the vet got ready to do the exploratory surgery today the lump had mysteriously disappeared! I felt it myself and two other vets had felt it on Saturday and Monday, but today it was gone! They did an x-ray and everything was normal. They did blood work and checked for FIV and leukemia. All normal except for some anemia. She is going home tonight with meds for the anemia and she'll continue with the antibiotics. Weird, huh!