Now remember that I understand that my theory is pretty crazy but just hear me out. I believe the Wispmothers are the ancient Akaviri from a previous invasion, specifically the Kamal race.
Now the reason I believe this to be so is because of the obvious Asian (so far mainly Japanese) influences. According to the in-game book, "On Akavir" the Kamal are snow demons that thaw out and attack the KA Po Tun. The have at one point invaded Northern Tamriel and even destroyed Windhelm before being defeated by the Underking and Almalexia. Now according to Japanese yokai legends, a popular snow demon is known as Yukki-Onna. The Yuki-Onna is a pale female ghost who wander the snows, luring people to their deaths, kidnapping children, and many more. The Yuki-Onna description is almost identical to the description in the in-game book "The Wispmothers". Seeing how that the Wispmothers are at least based on the Yuki-onna and the prior invasion of Northern Tamriel by the Kamal Snow Demons from Akavir, Its hard not to see the correlation.
Tell me what you guys think?