Will you be able to check around her old home just in case she did go back there? If she's used to being outdoors, she may well try to find her way back "home". That's a bad situation for all of you. She was reacting to being confined, new smells, lack of her guardian, and created the kind of havoc I've lived through also. You may find yourself having to remove and replace the lowest two feet of your walls which is what I've done - as long as you have sheet rock walls? I thought the insurance company covered the rental of a home in cases of fire? If your friend could find a rental with a cat-proof fence, it would be the only good way through this situation. Good luck in your search! Poor cat and poor you.