Checking for a UTI sounds like good advice. If you catch some yourself in a disposable pie tin and transfer it to a clean container then take that to the vet, you save her lots of stress and some $$.
My bridge c. spaniel loved baby rice cereal mixed with jarred baby food meat. He had also gotten very picky and at his old age, I just wanted to give him anything he'd eat - to spoil him.
Hugs to you and your sweet girlie.