As you know I'm having the same problem. I use Urine Gone too but lately I've found that white vinegar and water seems to be working the best for removing the urine smell. I mixed it half and half in a water bottle and spray it on. It works well on both hard and soft surfaces (carpet). I've not tried it on furniture - thank goodness that hasn't been peed on yet. (knock on wood)

We did set up the web cam but we already had the equipment and the software to make it stop motion is a free download online called Dorgem. Have you looked at web cams on eBay? Sometimes you can pick one up cheap there. Of course you will need to have a computer nearby since you have to hookup the camera. We use a laptop so it's portable.

As for the urine dye, I believe call florurescein, I talked to my vet about it and she said she doesn't know of anyone who has had success using it. It only stays in the system for so long plus you have to use a blacklight to find the stain. If the cat doesn't pee when the dye is at it's strongest you may not find it.

My vet recommended confining cats to certain room and then whichever cat you find in the room with pee is your culprit. That wouldn't work in my house with seven cats so we opted to use the "Pee Cam".

Sound like Anika really has a medical problem so I hope you are able to get her looked at and it's easily (and affordeably) treated.