What is the ruling on divorcing a wife due to her repeated insults to the husband's mother, despite the husband's repeated requests for her to care for his mother?

Insulting the husband's mother and treating her badly is a sign of poor companionship and an insult to the husband himself, whereas honoring her is an honor to the husband. It is permissible to divorce the wife for this reason, but it is better to avoid it and resort to advice, patience, and attempting to influence her to change her behavior, as divorce is the last resort.