I'm pretty sure its not urates its not chalky at all and it definitely looks like a mostly digested mouse, covered in fur and in the same general shape as her normal poop, just not quite poop yet. Her urates usually form in more of a ball shape as well. I wish I caught the action of her expelling it from her body so I knew for sure which end it came out. Last week when it happened there was a normal poop with urates attached to it then there was also something similar to what I found today.