[quote="fons_vitae, post:1, topic:212408"]
My mother was raised Baptist, though she's usually pretty skeptical towards any open displays of religion (my sojourn as an Anglican caused some problems with both of my parents). I think she is what I would term a "country deist": God exists, but He's not really that involved in the hardscrabble life she's known. He doesn't put food on the table or wash the dishes.
As a result, she puts a huge strain on herself and exacerbates her numerous ailments,* making our rather gloomy home even gloomier :( ... I'll be living with my parents at least until I complete my Master's, so there's no way to pack up and give comfort from a distance. I wish there was some way to make the divine more real to her--we're of two different minds, and she can be quite venomous if called into question.
*Not being insensitive here--we've had to deal with these problems for years.
As others have said, the best option is the easiest- pray for her.
The other parts of this are harder. She is your mother. Per the 4th commandment, you must honor her- not in lavishly attending to her, but in ways that are proper to her state and yours. This is part of your personal cross. I had to deal with a difficult father (may he rest in peace), and I know a small part of the pain you are dealing with.
If you can find time, read up on St. Therese of Lisieux. She mentioned having to deal with other Carmelites who were rude and obnoxious. She relished these opportunities because they were mortifications to humble her, they were sufferings which can be offered up to God for the salvation of souls and, in the end, she won the hearts of those nuns.
If you are living out your Christian life, it will shine through in your attitude toward life's problems (and her), and bring about a conversion of heart. That is my hope and prayer for you and your mother.