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Do they have enough room, in my opinion the more room the better. Do they have a red light instead of white or even better a heat emitter. This will give off heat without any light at all. I just heard of this and will be doing this next year! Put some branches in there for them to roost on if you have enough room, and if it is warm enough where you live, put them in a temporary pen outside for some fresh air and allow them to be chickens.
They are running after her and pecking her because they see the red on her neck. Chicks/ens are attracted to the color red, and don't forget chickens are cannibalistic, they'll go after they're own kind if they "smell" blood in a second. If you can put some blukote on her and seperate her temporarily, that would be a good thing to do. If she has a buddy, put them in there with her. Chicks are social, they need company. Hope this helps and someone with more answers comes by soon.