What should a husband do whose wife and her family accuse him of not spending and of bad character, and she threatens him with separation, then she retracts and asks for an increase in spending?

You did well by retracting the divorce for the sake of the marriage, and you must be patient with your wife's mother and treat her kindly. As for maintenance, you must provide your wife with what is sufficient for her, without extravagance or stinginess. It is not permissible for the wife to leave her husband's house except with his permission; otherwise, she is disobedient and rebellious (nashiz), and she is not entitled to maintenance.