Traditional songs women sang: lullabyes, songs to accompany women's work, ballads to pass the time.A woman writer whose texts have entered trad music: Lady Nairn (Scotland).
Some famous female collectors of traditional song: Helen Hartness Flanders (U.S./Vermont), Edith Fowke (Canada), Helen Creighton (Canada/Maritimes).
Women on collections of traditional song: listen to any Lomax collection, or Library of Congress disk, or collection of ballads from Folk Legacy.
These are just off the top of my head-there's lots of women out there. Just look around...
--Charlie Baum