Brand new furniture becomes trash in months. Gotta mop up streaks when she decides to hide behind the couch and not drink her water. Get woke up in the middle of the night when fatty decides she didn’t eat enough.
I could sit here and type for a hundred years and not even come close to airing out my frustration. :p
God help me.
You can do it when they're seven years old. You just have to be persistent with it. I've taught older cats to come when I whistle and to pay attention when they're doing wrong stuff.
I have to wonder if maybe she's not lonely. Maybe a kitten/cat buddie would help her release some of her pent-up furniture/door frame aggression.