There is an older saying "No amount of reality will convince the lunatic"
Have a lovely evening ma'am.
As for Chavez (presuming you aren't!), she kept her mother until it became inconvenient to do so. Mom with mobility, acceptable. Mom with not so much mobility -- adios.
But of course she doesn't say, Mother, you're more bother than you're worth to me. She says, Mother, you'd be trapped here. I set you free!