I think she's 21 weeks
I got her when I bought silkie eggs one time this last spring they sent 17 eggs total with three being bantam eggs as a bonus. I was ecstatic! Not only did I get my fuzzy chickens but I also got the little cochin, and my little self blue oegb. In truth I don't think the cochin is real good her legs seem kinda naked to me lol but she's cute and I don't really care although I would love some more maybe large and bantam sized. I have such an addiction. The third bantam egg quit very early and I never found out what it was, I wish it would have hatched. But from what I've heard for my first hatch and shipped eggs 8/17 was awesome especially BC three silkie eggs weren't fertile. Yay! And I love them all. Still not sure on the sex of two silkies but I got a gorgeous little splash and a beautiful partridge roo, three whites, and a little buff which I was told was a roo but that's okay we're keeping him anyway.
The smaller very light egg is the one in question, the larger one is an Isa Brown egg I got yesterday from my almost 25 week olds.
I think she moved at the last minute so the image may have gotten cut off is so I'll have to take another later. Lol