Oh most definitely it is for all women. The term Wicaglata is pretty well used across the board for the women singers now. Used by different tribes all over the states and in Canada. There are Wicaglata contests now by some of the biggest powwows ..... and it is Northern and Southern.... so it's not exclusive any longer.
The reason why some prefer the term Wicaglata is because it means so much more than just singing behind the men. This is one of the things that would be discussed in the forum when we would get it.