Wow, thanks for all the ideas!
As far as putting her outside, it really isn't an option for us. If you ignore the dogs in the area (and there is a pit bull next door), we live in a urban area and there are cars. I don't know any cat, declawed or not that can win a fight with a busy street. I think it would be irresponsible.
I am simply putting my foot down when it comes to cat diapers. I don't even think I need to explain the implications of something like that. Baths, never being able to leave the house just in case she needs to be changed, the cost, diaper rashes, etc. If she was really really old and needed something like that for a month or two that's one thing, but, I am not diapering a cat for the next 15 years.
As far as the baby being the cause. This all started 2 years before the baby was born. Not to mention, he's staying, so, she's going to have to get over it.
I can certainly add more boxes. So, we'll try that. And we have just recently started her on wet food with a cranberry softgel pill mixed in. The vet said she didn't have a UTI because he didn't find any white or red blood cells, just some slight crystals and slightly concentrated urine. He didn't think it was the cause, but, I figure wet food instead of dry and some cranberry can't hurt. They both seem to really like it, actually.
One question about getting her to take the pills. What do people do if they, say, want to go somewhere for a long weekend? I can get a neighborhood kid to scoop and feed them, but, where am I going to find someone who knows how to pill a cat? Do people kennel them like a dog? Wouldn't that stress them out further?