Technically I know this thread is complete, BUT I feel like we reached another milestone and wanted to share.

She's been so unsettled and feisty and literally falling asleep on her feet and immediately jerking back awake when she starts to fall over. The only way I could get her to actually sleep was holding her. I FINALLY caught her actually nestled down and dozing.
Being a baby chicken is hard - she must be just so stressed and handling it worse than the others. I hope that doesn't mean she'll be a sensitive adult that's prone to being sickly, but if so, then she'll just be a pampered chicken I guess.
Side note - on this one, should I be monitoring her weight gain to make sure she's growing, or is it moot point to do so? She doesn't seem to growing as fast as her mate that's the same age.