My Stedman went several hours without peeing and I knew that something was wrong. He was TRYING to go though. He would lift his little leg and nothing would come out (or sometimes it would just be teeny tiny little "dribbles" of pee) - it was terrible!
He also couldn't poop. I took him in right away and it turned out that he was backed up (they had to go in and "clean him out") and he also had a UTI (Urinary Tract Infection) and they had to put a catheter in him. They thought that he might possibly have a stone and if so, he would have needed surgery, but after several x-rays and after him being put on meds and peeing like normal again, it turned out that he didn't have one (a stone) - thank God!
I would get your little angel to the vet right away. If she hasn't pee'd in 12 hours,
something is going on. This can also be very painful for them if they need to go, and can't