As far as I can tell, Dawes tended not to use mixte frames (from looking at old catalogs in the archive) but more to the point you’ll struggle to get any women’s frame in 23” that hasn’t been custom built. I ride 23.5” and I’m 6ft. Dawes produced women’s frames in 19.5” and 21”, women are on average shorter than men. (There are exceptions - my youngest daughter is 5’ 11”)