If she cared enough, she would keep her license up to date,
even if she did not practice medicine. Probably to cheap to pay
for the costs of continuing education and license fees.
I believe you must put in a certain amount of time treating patients in order to keep your license current. My Congressman is an MD and I think he said this. Rand Paul, also an MD, treats patients (gratis).
It isn't like a driver's license.