I have a theory. Remember in the flashback when Anna Leigh told Fiona a witch may have many powers but still not be The Supreme if she can't do The Seven Wonders. I think for the first time, the Salem Coven has produced a generation of all Supremes instead of it just being one. Ever since Fiona's health has been going downhill all the girls have been developing powers at record speed. And the struggle in the house of who is the Supreme has become out of control because they don't realize they all are Supremes.
Nan gained Telekinesis.
Madison gained Pyrokinesis.
Zoe gained the de-spell power.
Misty already has resurgeance.
(Mind you 3 of those 4 powers are one of The Seven Wonders. Zoe's is not confirmed as being one)
With time Misty and Queenie may develop more abilities as well.