This woman was giving a Gemara Shiur, not Nach or Halacha.
1) Did other women want it?
2) Was she in-your-face about it?
She could have given it quietly at home, too. Every rov and/or shul board has the right to determine what goes on in the shul, but none to determine what goes on in homes (except if the rov is asked whether so-and-so’s kashrus is reliable or if chas vesholom there is abuse and the rov is the one who is notified).
I suspect there was an attitude problem.