I don't really know what's going on. If you want to breed chickens with good Mille Fleur coloring, you could just cull the oddballs. (Cull in this case meaning to avoid breeding from them, no matter what means you use. Keeping odd ones in a separate coop and not hatching eggs from would be one form of culling.)She looks so different than the other pyncheons. And I had an adult that looked like that, almost quail with a white spot here and there.
That seems logical, if it was not visible in either parent.So if this chick stays like that, it must be something recessive?
Or there is a chance that the two parents have the same color but caused by non-matching genes, and those genes are re-combining in interesting ways in some of their chicks.