Toothache<br>Karen was dealing with a small skin infection one week. She had an appointment the next day with her dermatologist. That night she experienced massive pain in her lower jaw. Karen had to cancel the appointment she had made with her doctor. She made a different appointment with a dentist shortly after.
Karen had no appointments for a short time after cancelling the one with the dermatologist
it is correct because the article states she cancelled the appointment with the doctor and didn't make the appointment with the dentist until shortly after. Therefore, she had a short period of time with no appointments. The system doesn't recognize this period and thinks she had an active appointment the entire time