The Bride of Redemption is Drowned in a Casual Marriage (1) / Hachiya Nanao

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Estelle, a daughter who has been shunned by her family because of an incident in her childhood.
One day, she was charged with an unprovoked crime.
She is ordered to marry Andric, a wizard with strong magical power, and to give birth to his children.
Although the marriage was just a formality, the days of peace continue with Andric, who is clumsy but cares for herself.
However, every time peace comes to Estelle's heart, her memory of the past irritates her.
"All I have to do is to have Andric's children."
What she did to fulfill her role is --?