Maybe she is Athiest. If she was more religious she might get a holiday.
In the U.S., National Dentist Day was March 6, 2022... The tooth fairy works every day, as millions of teeth are lost by children, not confined to one particular day. The Easter Bunny and Santa Claus do not work 365 days a year.
So...she deserves a LOT more honors, doesn't she?
The dentist charges to take our teeth, at least the tooth fairy leaves money.