Dizzy, I actually saw the "Glasgow Girls - Women in Art and Design 1880 - 1920" exhibition at the Kelvingrove Art Gallery, Glasgow many years back. The exhibition ran from 24th August 1990 - 6th January 1991.
I still have the mounted poster from the exhibition.
You can still buy the book from the exhibition:
Glasgow Girls: Women in Art and Design, 1880-1920: Jude Burkhauser: 9781841951515: Amazon.com: Books
I loved Charles Rennie Mackintosh when I was at art school many moons ago. I eventually grew out of liking that particular Glasgow Art Nouveau style, but I still have a large framed architectural drawing of the Glasgow School of Art hanging pride of place on my wall. I still love it now.
(if I get time Dizzy later on today I'll photograph it, and the exhibition poster, and post it here)
Charles Rennie Mackintoshes style was simpler and not ostentatious as much of the Art Nouveau style around at the time (and more elegant for it).
Dizzy, I think there is a lot to be said for the phrase 'behind every great man there is a great woman'. Much of the Art Nouveau movement was, very feminine in feel anyway. It is no surprise to me that the male artists, architects and designer made famous by the style at the time would have had strong female support and influence behind them.