She is staying home. That’s not the point...it’s when do you go back to work? You can stay CV positive after your symptoms are gone. That can last a few days, a week, maybe more. Seems as though a test would let her know how to better manage the return to her patients.
CoVid-19 can lurk for weeks in the body after symptoms are gone and tests show it’s over. Epidemologists don’t know when it is definitely over. I’d be nervous for months.