Are you including the many, many female singer-songwriters who are also guitarists. Think Mary Chapin Carpenter, Emmylou Harris, and on down to the obscure names. Recently I heard a lady from the Tex-Mex border region named Bianca DeLeon, who is very good at both guitar and vocals. Or are you trying to concentrate more on female studio musicians?

My former hometown of Downers Grove Il spawned Muriel Anderson, who was won critical acclaim. She is probably one of the ones you are looking for. Wonder if she is mentioned anywhere on the Chicago chapter boards.