No one requested it. She just thought Riftan would request it after the miscarriage because her dad/maids taught her that a woman exists to birth a heir for the husband.
After the miscarriage, she was taken to Agnes's castle to recover. Her dad went there because they were going to hold a celebration, but he met Maxi and told her she's useless and no man would want her. This is when she found out about the miscarriage and was devasted no one told her. The dad expected Riftan to ask for a divorce, so to hold it off and not "taint" the family (her sister was in the middle of getting engaged to the royal family and her dad didnt want the royal fam to think miscarriages ran in the fam), she agreed to go w her dad. Plus, Riftan wasnt communicating well. He yelled her to leave and that shes not needed at the castle the monsters had attacked. He didnt look at her while she was on her was to Agnes's castle, so she truly thought he didnt love her anymore.
All that happens within 5 chapters (i think) after she miscarried if you want more details.
When the manhwa finished. I suggest you read to have an idea of how mana/magic works since its tied to her m*****.
https://www.lightnovelpub.com/novel/under-the-oak-tree-540/chapter-183-30041322
**Miscarriage— She used a lot of mana to destroy a part of the mountain to crush the monsters.
Bit of bkgnd: She made it the the castle Ruth was at. A few days later, Riftan and most of the powerful soldiers left to defeat a group of monsters nearby. However, most of the monsters were near the castle and waited to attack until they left. She escaped w Garrow and Ulyseon (in the book, the use Yulysion). They were able to see a full view of the castle being attacked while crossing a mountain (to be fair, it wasn't FULLY attacked since there was a barrier being made by mages around the castle). Anyways, they were attacked by some trolls and Maxi was separated from Garrow/Ulyseon. After some attempts, she was completely drained but managed to destroy part of the mountain and crush more than half the monsters attacking the castle.
https://www.lightnovelpub.com/novel/under-the-oak-tree-540/chapter-227-30041322
Riftan finding out she was abused— You can read this ch to have a better understanding of what Maxi was experiencing at the moment OR go to the next one to know what Riftan decided to do w the dad :)
OMG KEEP IN MIND (it infuriates me) that this happens AFTER her miscarriage, so imagine how weak she was
It was SO heartbreaking since Ruth, Elliot, and Uslin also saw her...in the corner...crying...bruised...bloody....
https://www.lightnovelpub.com/novel/under-the-oak-tree-540/chapter-235-16091322