I'm pretty sure it's a pullet at this point. Her comb isn't getting any redder, just pink. And her coloring is getting more even (grey and orange-ish, like my other EE pullet).
Her tail feathers compared to her brother:
I've already realized that one of our 9 week old "pullets" is a cockerel, but please tell me that this one is a pullet. Her comb looks to be a sing row, but it's much more pink than her sister's. But it's lighter than her brother's. Of course, they all may have different mothers, so their...