Oh honey, don't fret!! It really is just guess work and she's had some lucky guesses. As Cinss said shes covered herself by backtracking on her first guess of BBG.
My SiL also announced recently that NO more grandchildren are allowed to be born in the family as she feels MiL has too many (she has 5)... Only 2/4 children even have kids lol! I dunno how people think they can decide the number of children others have!