doyenne
From Longman Dictionary of Contemporary Englishdoyennedoy‧enne /dɔɪˈen/ noun [countable] EXPERIENCEDthe oldest, most respected, or most experienced woman in a groupdoyenne of the doyenne of piano teachers in the cityExamples from the Corpusdoyenne• the doyenne of gossip columnistsOrigin doyenne (1800-1900) French doyen used for females