Well how old is she? If she's pretty old then....I'm sorry to say but she might be dying. I'm not a vet so don't get scared because it's just a option. But you should take her to the vet to see what's up. They will know. I'm sorry but hopefully this will work itself out. :)
How is she now?
She may have an infection or abscess from an injury or fight with another cat. She needs to be seen by a vet asap.
She may have an infection or abscess from an injury or fight with another cat. She needs to be seen by a vet asap.