I was just getting ready to post a link for you, I''ll post it for you just in case this happens again. I'm so sorry for your loss and I wish you the best.
http://www.mayoclinic.com/health/bee-stings/DS01067/DSECTION=treatments-and-drugs
I agree with you Mike. I was thinking along the lines that she mightve swallowed a bee, maybe a small scorpion.
After Michael Apple's recommendations, and when she gets to the point that your hen is able to swallow without complications; I recommend that you give her 1/2cc children's benedryl...