Ok I finally got her to lay in the box.
I sat in the coop with them. I lifted Scarlet into the first nest box with the golf balls. She jumped out.
I lifted her into the second nest box, she stayed a minute & I let her jump out.
I lifted her into the 3rd nest box with the golf balls and she stood there. Then checked out the golf balls, then checked out the straw. She seemed to ease into it, stayed a while, even after I left the coop.
Next day, egg in the nest box. SUCCESS!!
The ones who arent laying had zip interest in exploring the nest boxes. I'll do the same with them if I have to.