Thanks to Chris Spreit in Belgium, I began looking for a few more French women poets yesterday and in particular - Adrienne Blanc-Peridier, Henriette Charasson, Cevile Perin and Henriette Sauret. Oh the joys of the Internet - as I searched, I found mention of a Professor D.G. Mole who had organised a Conference on the subject in America in 2007.
Professor Mole very kindly sent me this reply to my query - for which I am extremely grateful:
"Works by Goldberg, Higgins, and Higonnet and studies by Chevillot/Norris, Khan, and Reilly are all essential reading to help you with the exhibitions, but you can profitably consult too Fell/Sharp, Gilbert/Gubar, Grayzel, O'Brien, and Ouditt".
Apart from Higonnet, whose book "Lines of Fire" is amazing, Khan and Reilley (whose books I read when I first began researching), I had not heard of any of the other writers.
As they say, "il y a du pain sur la planche"!