Hmmm. I'm suspicious of gender now... close to time for egg or crow... Do you think you could get closer to the hackles and sickles? Are they shiny and irredecent? He/she's a tricky one.
If Sarah is a leghorn, she doesn't look like my leghorn roo at 4 months old. HOWEVER... she shouldn't have such a big comb at 8 weeks old in the previous pic... so maybe she is a he... is that a big sickle feather near the tail there I see?