Thought I would update my own post... my broody made this decision for me. She had absolutely no interest in going back in that shed. She spent the entire day outside in the yard with the babies, and in late afternoon brought them over to where the other hens were dust bathing and joined the party-- I thought that was brave of her. The other hens don't seem to pay her any mind, but are a little curious about the chicks sometimes. No bad behavior
That evening mama went into the coop and up the ramp to where the roost is, and hopped in the nest box. She was somewhat distressed when the babies didn't follow (the ramp is way too steep for them) and repeated this scene a few more times hoping she could convince them to follow, before finally settling in the lower level of the ark coop on the bare dirt for the night. This has been the case for the last 2 nights, and everyone seems to be doing fine. I guess she wanted back in with her sisters!