JWdaughter... your Mom is still in? There is a procedure whereby you can help her. But I must saay that in the end, all you may achieve is bettering your personal relationship with her. She may not budge from the Borg.
My mother-in-law knows quite many things. But she sticks. Sometimes the adage holds true, "you can't teach an old dog new tricks." The reason is that the old dog doesn't want to learn. Even if it meant dying, they don't care anymore. I think they feel that life has passed them by.
The older generation has been doing it for so long that even if they were eywitnesses the a governing body orgy which included farm animals, they could still not move. Abused people often seek further abuse. It's a type of mental illness and it's widespread.