It's not that hard for her to get downstairs, I think she is just lazy. She got used to having her things so close and now she doesn't want to have to walk further than 10 feet to pee.

At least now we don't have to listen to her crunch her kibble as we are trying to sleep. TD is a food we get from our vet (McKenzie vet), that is good for their teeth. It is extra large kibble that they have to crunch through, and this scrapes their teeth clean. Seems to be working for her. I also learned that it is considered a weight control food, if the cat doesn't pig out on it.