have a silkie hen that has been sitting since Feb 8th I do take her off if the next to eat and drink. as of yesterday she had blk diarrhea and smells bad. had the same today. no consistency just liquid. this is her second time sitting she just hatched 7 chicks on Dec. 21. 6wks later she is sitting again. she is eating and drinking. should I be concerned. she is about 9 month old. does not act sick.