I think it's a hen, roo usually has a larger, v shaped comb. I have a golden silkie, and have yet to see signs of a egg, yet no roo behavior. I think they are just "slow" to mature. Banty roo raised in the same group is very much a roo, with ego to match. You should see him try to challenge my dominent roo - talk about David and Goliath!!
Dang, I have had these silkies for over a year and I really don't know where he came from. The only thing I can think of is the baby my one silkie hatched last year. I guess he grew up over the winter and the one I thought was him when they came out today was a little hen.