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.
Why were the Pretty Mean Sisters jilted that lead them to formt he alliance?
Moore and Mero separated on the November 22 episode of Sunday Night Heat.
What is an interesting fact about the Pretty Mean Sisters?
Vince Russo was the creator of the storyline, which Terri Runnels originally fought him about doing.
Who formed the new alliance of the Pretty Mean Sisters?
The new alliance of Prettt Mean Sisters were Terri, Jacqueline, and Ryan Shamrock.

Question: Why did they form the alliance?
Self-contained rewrite: Why did Terry, Jacqeline, and Ryan form the Pretty Mean Sisters alliance?