Yes, she's the only one showing pink. She's been pink for the last week. Feathers look pullet to me the pink is throwing me off though.
That's a tough one. Mostly looks like a female. Was it hot out? Sometimes a pullet's comb can get flushed. I suppose it could be a late bloomer, but 8-9 weeks is pretty late.
Do you have others to compare it to? Compare the comb color when they're under the same temp conditions. Also compare the thickness of the shanks & how they stand.