I thought a while back someone told me you could tell by the number of rows of beads on the comb. Does that sound familiar?I say cockerel. At 8 weeks, she shows lots of red in that comb. No way that's a pullet, IMO, sorry. I could certainly be wrong here, but after raising so many Ameraucanas and a few EEs, I've never had any pullets show that much red at 8 weeks of age.
Here is an EE pullet at 12 weeks old, a full month older that your bird--see how her comb is still barely even pink yet?