I haven't heard that before. I have 8 other chickens her same age and they all have tail feathers (ISA Brown, golden comet, SGE, PBE, green queen, orpingtons), so it really confused me. Do you think she has to molt first, or could she just grow them in?
I have a 13 wk old ISA Brown (red sex-link) hen that never grew a tail? Not sure how to describe it. She has like three white tail feathers that come out at the sides, some type of red humpy feather collection on her back near her butt, but she never grew an actual tail like the two other ISA...