How can I be a righteous wife, then a righteous mother, and maintain that, especially with my lack of experience in dealing with marital problems due to my upbringing, and how can I deal positively with my mother-in-law despite some negative behaviors?

The matter will become easy for her soul, and anxieties will depart. Her awareness of some characteristics within herself, which she fears might be an obstacle, is half the solution and remedy. She must strive against these characteristics, for the Prophet, peace and blessings be upon him, said: "Do not get angry."

To learn how a wife should deal with her husband, she can read specialized books such as "Tuhfat al-Arus" (The Bride's Gift), and benefit from the experiences of her married relatives and friends.

Regarding her fear of her mother-in-law's actions, the principle is to interpret her actions as harmless until proven otherwise.

For the happiness of married life, both spouses should fulfill their respective rights towards each other.