I do not know how any physician could make a diagnosis on the basis of a video. Physicians need to take a history, do an examination and run diagnostic tests to make a diagnosis.
Doctor on Demand - Telehealth App for Video Call Doctor Visits - VSee
https://vsee.com/blog/doctor-on-demand-video-call-doctor-telehealth-app/
Online virtual doctor visits are a growing breed of telehealth services beginning to dot ... Its pay model allows physicians get to take home $30, while Doctor on ... You Have A Real Doctor’s Appointment Using Video Chat On Your Smartphone“.
A “telehealth app” in which the patient interacts with the doctor, who still does many of the basics such as take a history, order some tests, and so forth, is not the same as a physician viewing a video of her coughing and making a diagnosis on that basis.
Considering how often even a group of physicians cannot make a diagnosis of a patient who is right there in the hospital, or how many times a person has to visit doctor after doctor before they find one who is familiar with their illness and can make a diagnosis—the idea that a physician who knows nothing about her health can make an accurate diagnosis based on a video is even less plausible.
She could have throat cancer, or HPV warts in her throat. She could have lung problems. Some people have suggested that she is coughing because of medications, or because of some neurological issue caused by stroke or concussion. Allergy seems unlikely because no other allergic symptoms are present, but maybe dust in the air from carpeting or drapes is irritating her throat.
We do not know. We can only hope it is something serious.