WHY IS MY KITTY LIKE THIS!!! HELP?

Cats can become very stressed and stop eating. Cats become strongly bonded with their catmate and thus become very lonely when that cat dies. Take her to the emergency vet, cats can become dehydrated and can die very quickly. As for your grandmother's roommate, you need tell him that this cat is not a toy for his amusement and that animal cruelty is a crime.