Does this look like a silkie egg?

Yes, that looks just like my Silkie eggs. Very small, and light tan colored. I hope my broody Silkie starts laying again soon...I love those eggs.

 

Mine won't lay in the nest box...she has only laid on the floor in the coop, same spot every day. I kept picking her up and setting her in the nest box, but she just jumped out. I know she can get in the boxes if she wanted to, but she refused. Then she went broody...

 

I'll agree....looks like a silkie egg to me too! My Cookie has been broody for 3 weeks now so every morning and afternoon I pick her out of her nest box and carry her out to the rest of the chickens. She growls and clucks, pecks at the cats, then goes about foraging for about half an hour before she does the egg song and goes back to her nest. Doesn't lay an egg, but makes it sound good.
If she wasn't eating, drinking and pooping normally I'd be concerned, but she looks and acts fine, just likes being broody, I guess.

 

You could try putting a next box on the ground right where she laid the egg...