Well thats what I figured I'd do - find something large enough for her to just sit in as well as get up to get food/water, since she won't be moving around too much anyway. Then if any hatch, I can work on a brooder to keep them all in.
If I were you, I would move her to her new permanent (transportable) nest where she currently is, and then once she has accepted the new nest, I would wait until dark, cover her with a towel and move her inside. Some hens do not like to moved and will abandon the next if it is not done properly.