We're moving house soon, and our 3 year old cat will be staying at a friend's house for a few hours on our moving day. They will be keeping her in a single room with her litter tray, food and a few home comforts. My only concern is that she hasn't used the litter tray since she was a kitten, because she's always gone outside. Will she instinctively use it if there is no other option than the carpet?