If your dog can eat chicken, I used to boil rice with chicken in it for Pyrate when his appetite was low. It was the only thing he would eat. I also tried giving him cooked liver, steak, etc. Basically anything that smelled good to get his appetite coming back. I used rice as the base to avoid the runs from the rich proteins. I also gave him canned pumpkin in his food which he loved. Raina is a bit trickier since she has so many allergies but I can give her oatmeal which she does like. Good luck with your girl. It's hard to see them not feeling well.
Snake Vom Eselspfad RN CGC (AKA Raina) 3/5/08
Pyrate CGC 4/1/03-5/16/12 RIP
Too many to list waiting at the bridge but remembering them all