How can a woman atone for her shortcomings towards her deceased husband, to avoid being held accountable for sins such as alienating him from his children and not respecting his physical desires?

The wife must sincerely repent and feel deep remorse for the injustice she committed against her husband during his lifetime, so that Allah may forgive her and compensate her husband. She must also strive to do good to him after his death, by supplicating for him, seeking forgiveness for him, giving charity on his behalf by consensus, and dedicating the reward of good deeds to him according to the preponderant opinion.