We are having a lot of building work done which means it will be dangerous for my cat to go outside for a few weeks so I’m going to set up a litter tray in a quiet part of the house. I didn’t think I’d pick up some soil from the flower beds where she currently goes and sprinkle that on the litter. Would that work or is it just too late to expect her to learn to go in a tray again after all these years?