Pendragon allows women knights (King Arthur Pendragon, page 41-43), but here I am further addressing the ordinary noble ladies of court who restrict themselves to traditional roles.
The King Arthur cycle is a very narrowly defined masculine story, and King Arthur Pendragon reflects that. It is about warrior noblemen, and everyone else has a secondary role, if any at all. Throughout the medieval literature a couple of peasants appear, priests mainly in the Grail Quest, and even then as narrator and background characters.
Women, noble women anyway, are more prominent than non-knightly men. The story would not be the same without Queen Guenever, Queen Isolt, Princess Elaine of Carbonek, Morgan le Fay and the Ladies of the Lake. Many ladies appear in stories, often to inspire or bewitch the knights.
Here are some additional materials to expand their part beyond the information in King Arthur Pendragon.
Randomly determined characters present the opportunity for extraordinary individuals, for good or ill. Here are the variables to generate women characters. Traits, etc. are also contained here.
Women don’t get heaps of Glory the same way that men do, simply because they do not participate in the many dangerous and foolish adventures that men do. However, they do get Glory for other things.
Women in King Arthur stories are often passive, but just as often seem to have some mysterious power over men. Feminine Mystique provides those for the game.
Age affects a woman’s ability to bear healthy children. These tables take this into account.
Women do not participate in knightly tournaments, but they have their own competitions. The pageant is not its own special event, but takes place at any formal court meeting when the women gather.
Women can earn some extra, personal money through Industry.
How many skills does a wife have?