BTW, BYC’s crowing rooster video contest lineup has a Sebright hen crowing...
https://www.backyardchickens.com/threads/crowing-non-crowing-rooster-video-contest.1532895/page-10#post-25954085
This is my 5 yr old Sebright hen, Moonshine, currently in broody jail. She has never had as much comb/wattles as does @Chicken poppy young bird in question. But, that being said, she HAS crowed before. Sebrights tend to be very outspoken....
It looks like it has a pretty big comb and wattles for a Sebright pullet. Sebright pullets don’t get red combs until right before they lay. As the above post says, all Sebrights are ‘hen feathered.’ Comb and wattles are the only visible indication of a male. That and crowing.