Final answer:
The LibreTexts excerpts provided do not contain information about Nina's doctor's appointment or school schedule. They focus on themes of motherhood and sacrifice.
Step-by-step explanation:
The question regarding Nina's doctor's appointment and her school schedule is not explicitly answered with the supplied text excerpts from LibreTexts. The information provided focuses more on the character interactions and backstory rather than specific scheduling details. The passages center around Nora and her interactions concerning her children and their nurse, tackling issues of motherhood, sacrifice, and societal roles rather than the specific times of appointments or school attendance.