This is an older hen, yes? If she is still pooping it's unlikely that she has an obstruction. Slow crops can have many causes. Such causes can be cancer, parasites, protozoas, bacterial infections, fungal infections, disease, ascites, etc.I just massaged it, and emptied some of it. Hopefully she will feel a bit better, she may have an obstruction?
Can you get your hands on a bag of fluids and give her some subcutaneously? If not, do you want to learn how to tube feed?