Back when Qin Xue used to live with her grandmother in the countryside, she often heard the proverb, "The first ten years look to your mother-in-law, the next ten years look to your daughter-in-law."
It means that when a daughter-in-law first arrives in her new home, she finds it strange and unfamiliar. This is the time when she needs care, tolerance, and understanding from her husband and mother-in-law the most.
After all, a woman who once was the princess of her home is now married off to a strange family. She has to develop relationships with the new family members which can bring substantial differences and views. If people in her husband's home treat her well during this period, she will be grateful and will reciprocate the kindness.