In Adoptive Father, why didn't Grandma Jin let Xiaoyu go home?

In the TV series "Foster Father", Grandma Jin refused to let Xiaoyu go home. First, when Xiaoyu was young, nothing went right with her father. Grandma Xiaoyu asked someone to tell her fortune. The fortune teller told Xiaoyu to kill all the men in the family, so when Xiaoyu and Grandma Jin went to see Grandma Jin's sister, Xiaoyu got lost and didn't want to find Xiaoyu again. Second, Grandma Jin has always wanted a grandson, but Xiaoyu is a girl, so she doesn't like Xiaoyu. Third, Xiaoyu's mother and Grandma Jin have been separated because of Xiaoyu's loss, for fear that Xiaoyu knows that Xiaoyu is lost because she doesn't want to get it back.