Oh Rich...your poor Momma' snake. Man, she has to be uncomfortable. hope fully that nice long drink will help her, as well as the swim. I wonder if lack of substantial exercise in captive snakes is the reason for so many egg-binds.
I believe it is lack of exercise, and pushing females to breed young and small. Someone on the KS forum said, that Calcium levels in the bool become depleted and makes the snakes muscles fatigue. So injectable Calcium many times helps, maybe even oral Calcium if it is of a quickly absorbale type. Of course there are many other reasons it can happen also.