The Seven Sisters is another faction or organization in Beast Wars:Uprisings. It is unknown what they actually are, kind of like the Exiles. They're not a sisterhood, but worship Asumorah and six more unknown goddesses. Not as gods, but like how communists worship Karl Marx and Bernie Sanders for 'their contributions', or like how people nowadays worship the Roman Empire, Ancient Egypt, Byzantium and all other old nations for something they though was impressive.
They have other members besides her, though.