The baby rice cereal is a good idea, you can mix a bit of baby food chicken in it....just give it a swirl through the cereal, don't mix it in thoroughly (kind of like the peanut butter and jelly stuff at the store).
When they have completely lost their appetite, it may take a bit before a dog is interested in eating - they get anorexic. If she's showing a little interest, scoop up some on your finger, then tease her a little by swooshing it by her nose swooshing it away without trying to get it in her mouth. Play with it a bit. "Do you want it? Mmmmmm, smells good!" (sniff it) Then wipe it off your finger into her lip pocket and see if she'll develop a taste for it that way. Just a little bit at a time to start. Better to give her less than more starting out. Once she gets her desire to eat back, she'll be really interested!