• Jeanne d'Albret, Letters from the Queen of Navarre with an 'Ample Declaration', ed. and trans. Kathleen Llewellyn et al. (The Other Voice in Early Modern Europe), 2016

• Marguerite de Navarre, Selected Writings: A Bilingual Edition, ed. and trans. Rouben Cholakian and Mary Skemp (The Other Voice in Early Modern Europe), 2008

Käthe von Bora is tougher. There's some stuff in Luther's Briefwechsel, but I don't have the slightest clue how to navigate that in the English translations. If you're looking for a German contrast to the others, I might suggest Katharina Schütz Zell instead, some of whose works are also available in English in the Other Voice in Early Modern Europe series. Or, if you want to stay with Francophone, there's Marie Dentière of Geneva (and same). From England there's the Examinations of Anne Askew published in Foxe's Book of Martyrs.

You can find the original language citations for the French stuff in the books; I can help you with the German ones if you want (although Morata was originally from Italy and wrote in Latin).

Protestant women in the early Reformation is, as you have sussed, a radically under-researched topic (and incidentally why I have "& Earliest Modern Europe" flair).