What do you think has caused this?!?!
I found this below on the ASPCA site. Do you have a cat-only vet you can talk to? She's not idiopathic if there's a medical reason.Take her to the vet?
The classification of idiopathic aggression includes any type of aggression whose cause can’t be determined or explained through behavior history or medical exam. Cats with this type of aggression can attack their owners violently. They may bite repeatedly and remain in an aroused state for long periods of time. Redirected aggression must be closely considered and ruled out as a possible cause before a diagnosis of idiopathic aggression is made. These cats are dangerous, and pet parents of such cats should carefully assess their quality of life, as well as the safety of those around them.
A medical workup is essential for all aggressive cats. Some cats behave aggressively because of a medical condition or complication. In addition to acute painful conditions, cats with orthopedic problems, thyroid abnormality, adrenal dysfunction, cognitive dysfunction, neurological disorders and sensory deficits can show increased irritability and aggression. Geriatric cats can suffer from confusion and insecurity, which could prompt aggressive behavior. Certain medications can alter mood and affect your cat’s susceptibility to aggression. Even diet has been implicated as a potential contributing factor. If a medical problem is detected, it’s crucial to work closely with your veterinarian to give your cat the best chance at improving.