Are there groups where women can network or share information about their experiences with HEMA?

Yes, Esfinges is a female international HEMA network, created to unite and support women martial artists, and to encourage and assist more women tot take up the practice of Historical European Martial Arts.

Eliisa Keskinen of the Nordic Fencer blog writes, among other subjects, about women's HEMA, you may find articles here that interest you.

Finally, you may ask your questions and participate on the Brynhildr forum here on Fightschool.