I remember reading this long ago........I've had this happen just one time, and not with a Silkie but a standard Cochin. The baby got stuck in a feather that was stuck to another by a little bit of poo. I don't know how long the poor little thing was stuck there, but it was very much alive and well when I freed it. Momma seemed relieved to have the screaming peeper taken off her backside as well.
Nikki
..........and just had a chick get tangled in a loop of feathers on a cochin mix broody mama breast,
didn't kill it (it was fine) but I had to cut it loose from the broody, then cut the loop off the chicks neck.