In a clean litter box, put in a cup or two of unpopped popcorn kernels or plastic beads. Confine her to a small place. Once she has urinated, pour all the contents into a container, and take it to the vet.
Hopefully this will help.
Animals, what animals? My children just have alot of hair!
I wasn't the one that went to the vet. Apparently hubby got some elaborate instructions that he didn't admit to right away. Something to do with emptying the catbox of everything but some special crystals, waiting, sweeping up freshly-moistened crystals, immediate refrigeration, etc. etc.