I'm finding it difficult to determine if this bird is a pullet or roo? "She" is about 20 - 24 months old, hasn't crowed, bothered the other birds, etc.. all signs point to a pullet, but these are my first EE's so i'm not really sure how to tell them apart in terms of feathers, etc.
This is "her":


This is the obvious Rooster, who's 2.5 weeks older:


This is "her":
This is the obvious Rooster, who's 2.5 weeks older: