First order of business - pay close attention to the situation, but don't get too worried yet.  We experienced this with our Max when he went through chemo.  He always had a ravenous appetite, so when he started treatment and sometimes didn't want to eat, my wife and I would stress and think it was the end, that he'd never recover, etc.  Not true.  Chemo can really ruin an appetite for a few days, and it affects everyone (both people and dogs) differently.  My wife Diane (aka Maximutt on these forums) found that out firsthand when she underwent treatment for breast cancer a year later.  She has often said that if she knew then what she knows now, she'd have been a lot less worried when Max didn't feel like eating for a day or two.  The chemo drugs can destroy your appetite to the point that you look at food and don't feel the slightest interest in it, and even the smell of foods you once couldn't get enough of just turns you off.  That's what happened to her, and is probably what Princess is going through right now as well.

Try tempting her with something different than what she normally eats.  We had some success with Max by feeding him foods like those stinky anchovies that come in a tin, or our own table scraps whenever I barbecued meat, or chicken & rice soup, etc.  Anything with an interesting smell that she doesn't normally get as part of her meals.  This isn't a permanent change in diet, of course.  It's only meant to stimulate her appetite enough to get her to at least eat something.  She can go back to her regular food once the drugs flush out of her system.  Give that a try and see what happens. My wife can probably remember a few other tricks that worked with Max - I'll see if she does.

We didn't have any experience with Palladia; but if her last dose was just Friday night and it could be causing some tummy issues, it seems to me like a day and a half isn't enough time for it to be completely out of her system.  Whenever Max was having diarrhea issues, we usually switched his diet over to chicken with rice, or chicken with mashed sweet potatoes for a few days.  We would also had a spoonful of canned pumpkin, as others have already suggested.  Whatever is ailing Princess, I hope she gets to feeling better very soon.

I know AngelAbby's mom (Jackie) had some similar experiences with Abby getting sick on Palladia, hopefully she'll add some advice here.  

Hooray! Glad you get to go home! Hope you feel all better.

Ahh, the powers of chicken!

Jackie, angel Abby's mom

Here's hoping you feel better soon Princess! 

Extra chunky peanut butter.  They can't tell the difference b/t the peanuts and the pill and never know they took meds!

For some (but not all - just the really big and/or stinky ones) of Abby's pills, I would just pop them down her throat. Then give her a really good treat AFTER. I read (maybe it was on this site) that a trainer said you should always follow the bad (like having to take a big ol' pill) with the good (like a really yummy treat). As you said, if you try to slip them the bad stuff hidden in the good stuff, they can start to become suspicious of the good stuff -- and the good stuff doesn't taste so good anymore.

For her smaller pills I would hide them in cream cheese or braunschweiger (which is very gross and stinky and she loved it).