She seems very much like my friend's stepmother who somehow roped his poor dad into marrying her after his wife (her cousin) died. My friend was a senior in HS, and he got out as soon as he could to go to college, but his poor brother and sister had to suffer for years with her insanity. She made everyone miserable, including their dad. One day, after she found the little brother's Playboys and destroyed his room, smashing his stereo, and TV, along with smashing his "Satanic" records, dad finally had enough, and changed the locks on the house when she went to visit her mother overnight a few days later, and laid divorice papers on her a few days after that. She tried and tried to get the house and custody of the girl, who was about 7 or so. When the judge, when he asked her who she wanted to live with, "If I can't live with my dad, could I be an orphan instead?" The judge asked her why, and she said, Well, it would probably be better than living with Cathy!" Needless to say, she didn't get custody and much of anything else out of the marriage. Two years later, my friend's dad married again, and she was ok, they were married until he died about 25 years later.
IMO, Cathy was about as insane and evil as people get.