My 11 week old Blue Laced Red Wyandotte seems to have lost her comb. At least I thought she had a little one, like the others in the 11 week old flock, but honestly I don't remember. There's none there now but a tiny nipple at the back/top of her head. She seems healthy otherwise, although has always been small compared to the others in the mixed flock (Barnavelder, Wellsummer, Barred Rock, RIR, ISA Brown, an olive egger, Dominant Copper). I've never seen her, or any, being picked on. They've got a lot of space and free range all day. Is this something wrong with her? This is our first chicken adventure.