benefactress

From benefactor +‎ -ess.

benefactress (plural benefactresses)

1. (dated) A female benefactor.
   • 1821, Thomas De Quincey, Confessions of an English Opium-Eater:

     Oh, youthful benefactress! how often in succeeding years, standing in solitary places, and thinking of thee with grief of heart and perfect love—how often have I wished that, as in ancient times, the curse of a father was believed to have a supernatural power, and to pursue its object with a fatal necessity of self-fulfilment; even so the benediction of a heart oppressed with gratitude might have a like prerogative, might have power given to it from above to chase, to haunt, to waylay, to overtake, to pursue thee into the central darkness of a London brothel, or (if it were possible) into the darkness of the grave, there to awaken thee with an authentic message of peace and forgiveness, and of final reconciliation!