Some have suggested bringing up religion. I do think that in this situation there are other issues to deal with first, and that the woman sounds as if she would be very unreceptive, and could increase her hostility once she realizes it upsets you. While she is so hostile, talking about religion could make you seem righteous and therefor alienating.
It could do more harm than good, As St Francis said, “All … should preach by their deeds”.
My son lived in a house where one young man was invariably aggressively rude to him.
Mt son who was always a likeable young man was hurt and rather oppressed by it, this unprovoked rudeness and nastiness.
I told him about Saint Therese, how there was an old sister who was cranky and difficult, and no one enjoyed assisting her.
Saint Therese made a point of not just helping as required, but doing little kindnesses, and would give the old nun her ‘very best smile’. It took a while, but the old nun softened.
My son took that on board, and without expecting any improvement or reward, he began little courtesies, something as simple as greeting him in the morning with a coffee and a quietly kind attitude. He kept it simple
He came to me some weeks later with one of his delighted smile,
Mum, I took your advice, and today he’s apologized for his past behavior, and he’s become pleasant to me.
People who are unpleasant and cranky usually become so for a reason, and it usually has something to do with unhappiness.
Treating the woman with respect and quiet cheerfulness, not expecting immediate results, not losing hope, not stopping because of further episode from her. It is best to treat a person as a child of God, who is damaged and needs nursing back to health, but quietly, patiently, rather than immediately coming up against her bitterness and resentment that will cause her to react badly to religion.
Later, you may be able to do that.
Now is for being the true, warm, kind Christian yourself, a witness of God’s love for her.