I agree it’s not obvious. But I find the doctors response without even really knowing the girl to be condescending.
Doctors are often the furthest thing from being prescient.
I knew a young couple who were living in central Arizona when the girl came down with very weird symptoms. They saw 4 or 5 doctors who didn’t have a clue, and one of them said, “This can happen to young women”. Finally an Internet search found a 100% match of her symptoms to Dengue fever. With this information they went to a new doctor who actually did a test for Dengue. It was, and he was surprised because there wasn’t and hadn’t been a case of Dengue fever in central AZ in living memory.
However, doctors in southern AZ had been given an alert to look out for symptoms of Dengue fever. But not in central AZ.
The last clue was that there apartment was near some north-south railroad tracks. The mosquito likely hitched a ride.
A similar dilemma happened to an older man who had briefly visited Mexico and got himself a case of amoebic dysentery. He saw I think four doctors, with one thinking cancer, and another “that just happens when you get old.” He had dysentery for an entire month of misery, and it really hurt him, until one doctor asked if he had gone to Mexico recently. Yep. A quick test and one pill later and he was better.
Doctors are neither mind readers nor magical.