I've seen a fair number of barnies that are trying to lose their melanizers. I am most definitely NOT an expert, but I would bet that she is just poorly selected and is drifting away from the standard.
She is following the same general pattern of development as "good" barnies -- barring developing into lacing -- she's just not getting all the way there. Give her more time, and I bet she'll get even closer to the laced look -- but I also bet she'll never make it all the way.
She is following the same general pattern of development as "good" barnies -- barring developing into lacing -- she's just not getting all the way there. Give her more time, and I bet she'll get even closer to the laced look -- but I also bet she'll never make it all the way.