The only thing I worry about with the chicken livers is going overboard on vitamin A, since the Primal already contains liver as well. I'm not sure if additional liver would be too much?
What's interesting is it was only Athena who had issues, not Apollo, and Apollo ate way more bone than she did, so I guess every cat is different. XD
I'm also not 100% sure she was constipated, just kind of assumed, because she was meowing while using the litterbox that one time. She never does that. Would that be a sign of constipation? Or just her being weird?