When Samantha first came here, she had been here before Amy and Giz, only they didn't know it. To Samantha, they had invaded HER territory to she was trying to show her dominance or place in the house by attacking Amy every chance she had. Amy I felt was not able to defend herself and she sure couldn't take the stress of constantly being attacked. I tried all the things everyone else has suggested to you and like you, none of it worked. So then, I decided to try someting else.

Whenever she would attack Amy I would scold her, pick her up and put her in another room by herself and leave her in there with the door shut. I was consistant with it, EVERY time she attacked, she was put in a room by herself with the door shut... It only took 3 days for her to make the connection and the attacking came to a screetching halt.

Cats don't like being in a room with the door shut... they don't like being isolated and what does the Mama cat do when they act up.... she pushes them away, out of the litter, away from the rest. Try that... if you don't have a room, use a kennel but isolate the offender away from you and the rest of the household..