Please help my cat won't do anything on her own???

Nine year old Tabby cat refuses to walk to the liter box or to the food bowl, only eats and drinks or uses the bathroom when we take her. This happened a few months ago right after one of my other cats died. She has been hiding under the bed also. Any one know anything about this?

take her for a vet check up. Change of behaviour in a cat means vet time.