Queen Regent
mother or spouse of a monarch governing the state because the monarch is minor, absent or incapacitated
en-GB/ˈkwiːn ˈɹiːd͡ʒənt/
en-US/ˈkwin ˈɹid͡ʒənt/
mother or spouse of a monarch governing the state because the monarch is minor, absent or incapacitated