On another thread, I got a lot of good advise on how to train a kitty. Now that she's completely trained I thought I'd add a couple other things I learned from the vet.

*Some cats won't use another's box. We didn't buy a new litter box, and apparently she smelled the old cat and considered it off limits.

*Our new kitty had a bladder infection. She wasn't making it to the box in time, and it wasn't her fault.

After a few weeks, some antibiotics, and some patience, she is finally trained. Thanks again to all who helped me through this!