|Notice the bone at the bottom|
I only have circumstantial evidence that Dixie ate cat-shit. First, when I woke up this morning and looked at the litter box which is just outside my door, there was a pee-spot and a turd in the box. Dixie, who slept in my room, put her nose right to the turd and took a long, hard sniff. I commanded her to keep moving. I went back to bed. For the rest of the morning, my mom took care of the babies.
However, when I woke up the second time, the pee-spot was still there but the turd was gone. I asked my mom if she had cleaned the litter box: "No" she said. My bet is that Dixie ate it.
The second reason I think Dixie ate the turd rests on her digging episodes at the litter box. A few times Dixie has dug out everything in the box and making a huge mess in the hall.
So, with the turd going missing after Dixie woke up, Dixie sniffing the turd, Dixie's continuing interest in the litter box and no one cleaning the litter box this morning, all signs point to Dixie as the culprit that ate the cat shit.