In case you haven't checked it out, or have fallen behind with the Christmas rush, here is a link to Inside The Rock Era's first 25 artists:
http://top5000-rocketman5000.blogspot.com/2013/12/the-top-100-female-artists-of-rock-era_16.html
http://top5000-rocketman5000.blogspot.com/2013/12/the-top-100-female-artists-of-rock-era_16.html