I feel your pain, my wife got long covid back before that was at least accepted to be a thing. At first doctors are very dismissive, but gradually there were a critical mass of people able to demonstrate measurable symptoms.
Here is hoping that somehow your friends symptoms pass soon and are mild.
After seeing what long covid can do to a healthy 40yo woman with no preexisting conditions, where no one understands them at first, I can imagine the stress.
