Gender is a social construct that chickens have no concept of, so def not a transgender hen, beyond the fact gender has very little to do with sex characteristics or expression
BUT! If a hen loses the functionality of her primary ovary, or otherwise is suffering a hormonal imbalance for any number of reasons, they can develop all the secondary sex characteristics of a rooster. Spurs and crowing can occur in hens that have no issues. If she grows in sickle tail feathers and pointed hackles and ends up looking the part fully rather than just acting it, there's something off. It is more common in older hens. Since she is so young, I would be worried about an infection or even ovarian cancer. It might benefit her to be seen by a vet in such a case to confirm her health or identify what the issue is, if she goes full blow rooster regalia.
Her tail feathers are really odd, sparse and fluffy looking rather than hard feather sickles, and her comb isn't distinctly different in a way that screams Rooster instead of Productive Hen. I would wait and see, since she doesn't look different enough to cause alarm imo. Keep a close eye on her if you're worried. If there is something wrong, she could possibly be in pain. It is unlikely though!
Edited by Skink - 9/22/15 at 2:04pm