If a wife leaves her sick husband after taking care of him for 13 years, and he dies a year later, would she face punishment in Islam or on the Day of Judgment? How can she seek forgiveness for her actions?
Bismihi ta'ala
If wife no longer wishes to be with husband, for whatever reason, she will not be punished, unless she has wronged him. If she no longer had the tolerance or patience to be with him, then she is not going to be held accountable for that. She probably did her best, and it could have been too overwhelming for her.
This is more a moral situation, rather than a shar'i situation.
And Allah knows best