What is the ruling regarding a wife performing Umrah without her husband's knowledge, after he forbade her, knowing that she always says she sees no good in him?

The preponderant opinion is that Umrah is an obligatory duty for whoever is able. If your wife has not performed the obligatory Umrah before, then her going without your permission is permissible and not forbidden. However, if the Umrah is supererogatory, then her going without your permission is an act of disobedience and insubordination. We advise the husband to treat his wife with kindness, and the wife to recognize her husband's rights over her, to live with him amicably, and not to deny his good treatment.