* You'll have to probably take her out of the brooder separately to feed her at least a couple times a day--3 would be even better. The other chicks are growing faster and are more active and vigorous, right??, so you'll have to make sure they don't start bullying her or pick at her. Do a site...
* I wouldn't. I'd start "boosting" that baby right away. She may have malabsorbtion syndrome, or brain damage, or whatever-- but I''d start "body-building" the little bitty.