My wife and I went out to dinner tonight and had a good discussion on the subject. She's an NRA certified instructor in shotgun and has had considerable experience teaching wingshooting/trapshooting to novices, as well as helping coach experienced competitors.
She also supports offering women an option of women-only classes. She would be concerned if such classes were the only available choice, but strongly believes that it's desirable for women to have the choice.
"It is long been a principle of ours that one is no more armed because he has possession of a firearm than he is a musician because he owns a piano. There is no point in having a gun if you are not capable of using it skillfully." -- Jeff Cooper