Sounds like she is getting ready to cut the apron strings. How old is the chick? Most of our hens start distancing themselves around the 6 to 7 week mark. I am glad she is still keeping the chick warm at night. The last group we had in the pencil pen ended up being adopted by the rooster for evening roost warming. Luckily there were only 3 of them and the rooster was very tolerant.
She has to be right around 6-7 weeks old. She still has some down feathers on her head. Ana seems to know that it's still too cold to let her go on her own but she's definitely not the least bit concerned about where she is in the morning when the food is brought out.