Everything important has already been said, but I wanted to share one of my little girl's little idiosyncrasies ... she never touches fresh CGD, ever. In fact, she used to get so excited, watching us mix it up in front of her, crawling up and down the glass for the best view... and then we'd put it in her enclosure and she'd walk away!
She only eats "aged" CGD. The following night, when most of the water has evaporated and it is like fruit leather she tears into it, but never before then. If we try to give her fresh, she'll let it sit. If we mix it with less water, she will still let it sit. She's a nut, but that's how she's always been. So, just on the off chance you have a nut too - you might try leaving it a day as long as you don't see mold or anything of course.
As others have said, as long as there is output, there is input even if you don't see it - and it is very hard to tell with the little ones. Good luck!