[Sweet Apple]

I know I'm not the only one on the planet, so I'm looking for solutions to Apple's MAJOR picky eating problems...I've brought home samples, and she seems to like them, so I buy the food...Two days later, she won't eat...I know people are going to say "wait her out", but she only weighs 4 1/2 lbs. and it worries me if she skips a day w/o eating, and she will skip a day...A groomer told me to put a little of the cream top organic yogurt on her food, and I did, and she liked that for a few days, then that didn't suit her...I wish I had time for home-cooking, but however will I get all the vitamins and minerals in her food? I just wish I could find something she liked...She did pretty good on Innova for quite some time, then she stopped and lost weight...Lately, we've tried Acana, Merricks Before Grain, Solid Gold, Wellness, (something) Select (?)and a couple others I can't think of...What's a mom to do Also, will shelters take open bags of food, I've got a bunch...