Former Arsenal director Lady Bracewell-Smith feels the current Gunners board needs to be more "pro-active".
Bracewell-Smith, whose family have a long association with Arsenal, left the north London club in December 2008 and in April sold her 15.9% holding to Stan Kroenke, which paved the way for the American to launch a full-blown takeover.
However, she remains unimpressed with events behinds the scenes at Emirates Stadium.
Writing on Twitter, she said: "In time we will need a more dynamic pro-active younger board, and a good directional leadership."
No official reason was given for her departure from the board, but Bracewell-Smith added: "[They] couldn't handle a woman with power on the board. Felt insecure. Male chauvinism."
Bracewell-Smith claimed she was "caught in the cross fire" of a "war" between former Arsenal vice-chairman David Dein, who left the club in 2007, and late director Danny Fiszman.
Bracewell-Smith rejected calls from some fans for the return of Dein, linked to Alisher Usmanov's Red & White Holdings group, who are the club's second largest shareholders, claiming he was "the root cause of all the troubles at AFC" and was "unable to work with other board members".
However, today she posted a clarification, adding: "I stand corrected. Dein loves the club and although sometimes personalities fall out, his contribution at Arsenal has been immense."
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