I had this cat problem with bridge angel Loca. She kept trying to kill my cat. I had to keep her tethered to my waist with her leash for a month and a half. Every time she looked at my cat she was corrected, and sometimes even squirted with a water bottle if she especially focused on Linus. I praised her whenever she ignored her. She was muzzled whenever i wasn't home. I never crated her. Like I said, it took a month and a half of consistent hard work, but they ended up being good friends.