I hatched them out myself but the eggs were from the same place and they are the same breed so they could be full brother and sister for all I know. They both were my top picks from the group (of 14 that hatched and didn't succomb to coccidia) for confirmation...which I thought was kind of interesting. (criteria: no side sprigs and even comb spacing, Body good size and shape, good 5th toe development and placement, similarly colored) so you are right...it could be a genetic issue. if she responds to the probiotic and/or B vitamins, perhaps a predisposition to malabsorbtion? if so, I might need to face the fact that it would be irresponsible to breed her no matter how pretty she is.
I put her on the antibiotics last night so by tonight I should be seeing some improvement if it is a viral thing. if not, I will try the probiotics/vitamins tonight.
honestly, I am not a breeder so these chickens are just for my own pleasure. And she is such a sweetheart. I am so glad y'all convinced me not to send her off for necropsy, expecially since it wasn't Mareks. I would have been so upset if I had killed her for nothing.