My vet just called. He is equally shocked and wanted to send his condolences. He said other than the fact that she perhaps ruptured something internally, (he asked if there was any sign of blood or discoloration. I didn't see any at all and I checked). He said perhaps being that it was a hard urate plug, maybe the stress of it all was just too much for her little heart. He also asked if she was straining as well. I didn't see it at all. She looked completely normal. Like I said before, no sign of infection, no parasites, nothing. This blows guys.