i was told stories about baba yaga as a kid, although she was known as boney legs in the stories. but she was a witch who lived in the woods in a house that stood on chicken legs.
if i remember it correctly, Baba Yaga's russian, and kidnaps children who enter the woods alone. she flies around in a mortar [as in mortar and pestol] but sometimes she's seeked out for wisedom.
morgan le fay on the other hand i know very little about. i was never a huge fan of kind artur, if i'm not mistaken she's his half sister, and a sorcerer. that's about all i know about her i'm afraid. i'll mail you later, cuz i have my books at home.