In your first post you said it was not egg binding, so I gotta ask, did you check for an egg? If this ever happens again, with some hens you can tell if they have an egg by gently palpating them. The fatter hens are harder to check that way, so with them I put on a glove, water based lube and...
This hen really does need to be in a warm place, 80-85 degrees is ideal. If she stays outside there is a very good chance the cold will kill her.
-Kathy