I knew she had a doctor's appointment that morning because she’s pregnant. She didn’t show up for it … and I was even more concerned."
How did she know SW didn’t show up for her doctors appt? HIPPA (patient confidentiality) is a HUGE DEAL and that information wouldn’t be given out, not even to her husband.
We don't know yet but people have speculated that her friend was either supposed to go with her or at least watch the kids during the appointment. That's the only logical explanation because like you said the doctors office couldn't have told her anything.