Thanks for all of the suggestions! We have tried the pumpkin as well - she didn't like it, but would eat a fair amount if I fed her by hand (yes, she is SPOILED!). I will try the rice water and then rice/chicken before adding her dry kibble back in next. I, too, read about the Tylan and have already placed an order for it online. I will just store it away and try it if the kibble change doesn't help first.
Kori will typically eat pretty well - usually 1.5c of kibble both morning and night - but I'm assuming she just getting enough from it to actually put on any weight given the issues with the diarrhea. So frustrating and heart breaking!