After their settlement, Nari left the mansion with Kate. Since they couldn't communicate with anyone for now, they had to visit the mental asylum themselves where they had kept Grace and the general. They'll need to reach another agreement with the doctor so that they don't neglect Grace and toss her aside.
Any treatment is worth it. As long as she loses consciousness and the truth about who she is.
It had all been Nari's idea because she wanted to see her family after years of placing them there too. She hasn't found the courage to tell Kate about them and she doesn't think she would tell her about them. Anyone who heard of what she did to her parents never sees her the same anymore.
It happened with the Yong's, Veronica sees her as a bad child till this every day.