Why Is My Kitten Not Using The Litter Box Anymore?

I have a cat who is one year old. It has always used the litter box perfectly until this morning when I noticed it not using the litter box at all. I checked to see if she was sick, but she is fine. She still drinks water and eats her food just fine, so what could be wrong with her?

Asked by Member 1114017 on in Litter Boxes