Thank you all for the advice. I didn't read the posts until this morning. Chillin', I had planned on culling her if she was still straining later last night. I know there are times when that is the only compassionate thing to do. I don't know what kind of chicken she is. She was a "free exotic rare breed" that came with my peep order. She is black with a yellow spot on her head and shorter in length than my other peeps (Austrolorps, Orpingtons, RI reds) She is pretty much the same size everywhere else.
Anyway, about three o'clock this morning she started moving about, eating and drinking and pooping without crying. Now at 10:30 am, you would never know anything had ever been wrong with her. She is eating alot and drinking alot and pooping alot and very active. Her vent is back to it's normal size. Yippee!! I just hope there is no repeats of the constipation. I am still baffled at what that piece of white chalk stuff was.
The hatcheries don"t feed them before shipping, do they? Could it have been calcium?