If these are recent pictures and Blue Bell is around 7 months old - then its a pullet. Why? because the comb is VERY small, even my hens have a bigger comb that your girl does...ALSO she appears to be beardless or nearly beardless, and beardless silkies even the girls get wattles, but small ones, and they usually don't bloom till they start to lay...So if this is a 6+ month old beardless silkie - its either a girl for sure or a SUPER late bloomer boy....Beardless silkies are much easier to sex than bearded, because they get noticeable wattle growth, especially the boys...But I say shes just a 'hatchery' type silkie. I have some hatchery girls who have a very slicked back small crest, but are mean arse hens who are the best broody mamas.
I see absolutely nothing in this bird that says boy to me, except what I'm figuring everyone is thinking the crest's slicked back look are streamers, and the pink in the comb...but pink combs is pretty common in hatchery offspring, and silkies aren't supposed to have pink/yellow skin...if it was a male at 7 months I'd expect it to be turning red in this bird.
Edited by ScaredOfShadows - 1/2/12 at 8:18am