My guess is she is a mis-labeled Olive Egger. What kind of comb does she have? All my PBEs lay beautiful blue eggs although they do get lighter in color toward the end of the laying season (like now, in August, as production slows and I'm starting to see more feathers in the coop).My prairie bluebell laid a tan egg for her first one. All her eggs after have been green and not blue so I’m guessing she was cross bred with a brown egger.