Conversation so far:
Who are the Pretty Mean Sisters?
Pretty Mean Sisters (P.M.S.) was the female stable of Terri, Jacqueline, and Ryan Shamrock in the World Wrestling Federation in the late 1990s.
What happened with Pretty Mean Sisters in 1998?
Jacqueline Moore and Mero separated on the November 22, and the jilted Moore formed a new alliance of women known as the Pretty Mean Sisters with Terri Runnels.

Question: Why were the PMS jilted that caused them to form the alliance?
Self-contained rewrite: Why were the Pretty Mean Sisters jilted that lead them to formt he alliance?