Yes, I would expect to see some comb growth or at least reddening especially in the waddle area. That's why I asked you to pull back the crest. The one polish cockerel I had was also lowest on the pecking order and didn't start crowing until 7 months. My Silkie's however, are confident fire crackers and Polish are a more nervous breed... so that might be playing in.I sure hope not. The polish is the lowest on the pecking order, lower than the silkie who is half her size. I don't know if that says anything. Also, wouldn't the comb be growing by now if it was a cock?
I hope you are right though! I spent more time looking at male and female polish. So I will describe the differences I see...
So I already stated the lace pattern was male or not high quality (no ugliness intended), and I stand by that. I also don't see what I typically call a hen bump in the saddle area. But I know all birds are individual.
Currently the head crest appears more female than not... meaning rounded and uniform instead of spiky and wild.
My stance if it were my bird... probably a late blooming cockerel (we think all are guilty until proven female). But I wouldn't be truly convinced... behavior and lack of color would have me hopeful for female, with reservation for late bloomers which I have had even among the same breed before. One suspected female showed her true colors several weeks after all HIS brothers. Coupled with the red comb at 7 weeks statement by the other poster... Even at 13 weeks many females are pinking up in their combs... My final answer... Not confirmed but DEFINITELY hopeful your polish is female... It isn't throwing ALL the clues yet.
You should know for sure before too much longer (saddle feathers don't lie and even Silkies get them though they aren't as easy to discern)... I hope you will update!
Your Silkie is a nice blue color. Her crest is still female shaped. I have seen one line that would have had me saying female on a cockerel at 7 months old... but again if that were my line I could confirm female, and can tell most my boys by six weeks old. Even had one crow at 4 weeks, and others trying to mate at 8 weeks. It's a lot easier though when you have others from the same batch for comparison, like Alabama Fly.