About this, that's how I would expect a crate to look, add in a toy of some sort. The dog doesn't look too thin, and that's about what my dog eats, I fill her bowl (about two cups) and she doesn't finish it off until a couple days later, and feeding once a day is fine. I free feed because my dog doesn't overeat.
As long as the dog does come out, and is getting appropriate exercise, it's okay.
Then it's possible that it's dehydration coupled with the fact there is an underlying issue that's causing her to pass her food?