This hen is well now. It turned out that she had a 7 inch rope of hay that we put in the run, impacted in her gut somewhere. I managed to get her to pass the blockage after dosing her 2x a day with Dulcolax for about 3 or 4 days. After passing the blockage, she developed a serious internal yeast infection, which I treated with miconazole, and straight doses of probiotic powder from capsules, which took about 2 weeks to clear up.
All in all, it took 2 months to bring her back to good health, which was a miracle.
I do NOT recommend that people use hay in their chicken housing, unless run through a shredder first. Lesson learned!