Perhaps the sickness was because of her broodiness, meaning she couldn't get up, eat, drink, and move around as she's supposed to. At least you can help her properly now! :highfive:
I think she's broody, based on your description, but is there any feathers missing from her breast? Does she peck you or issue a warning cry if you reach toward her eggs?
Those are sure signs of broodiness.
Tell us what happens! :thumbsup