Do consult with your vet plenty, although it sounds like you're already doing that.

When Jasmine used to need her medication, we did baby food at first. But within a week she tasted the meds once when it wasn't mixed up enough, and refused baby food overall.
For a while we fed her shredded chicken, mushy rice, and kitty vitamins all mashed up. We'd make a small tupperware full and dole it out as a treat (gently warmed, of course) a couple times a day.

The other obvious one about eating is to check her teeth. Our siamese have had serious issues, and Lucas has few teeth left. If she's either lost teeth, or if her teeth are bothering her, that may well account for part of her lack of solid food appetite. Although it's late in life for you all, working with the vet (possibly to extract any teeth that are painful) and brushing her teeth might be an idea. Yes, Virginia, they make toothbrushes for cats - usually a soft fingertip brush - and toothpaste, which is usually quite a treat for them.

G'luck! I'm definitely laughing over the cat eating homemade chicken soup and gefilte fish.