I integrate my Chicks and Hens when tiny. Momma protects them and the process goes smoothly. What your seeing is she is at the bottom of the pecking order and they don't want her back. The mother chasing off the Chicks is weaning them. She is done being their Momma..
Another topic I like...:frow....
Chickens in a Nutshell..:gig
When getting Chicks or Chickens I stress getting Docile Breeds...First time owners should not start with production Layers as they require too much management...
Do not get docile breeds and mix with more aggressive Birds...It never...