Ok, I will separate her. Can I give her a tiny bit of our sublingual b12 vitamin? I will go and get some dry kelp, I think I have some 7 grain cereal, I will grind it some more. Maybe I should make a mush.
If you feel you need to separate her to make sure she gets enough food, you could separate her with several other chicks. I had a chick with a vitamin deficiency last time and put her with 2 other smaller chicks and gave her infant polyvisol (without iron). she recovered in a few days.