B.C.
He Said She Said - kids of divorced parents always seem to try this game. To nip it in the bud, all the adults need to communicate with each other directly, and the child needs to know it (speaker phones make it so easy). It makes the stories she tells just that - made up stories. There's no question on some level she's jealous of her new sibling and this is her way of refocusing attention on her. What kid doesn't want to be the center of the universe (especially teenagers)? It almost sounds like she wants to tell everyone what she thinks they want to hear. Just keep up what you are doing, but step up talking with her Mom.