Alrighty, I'll weigh her and use the chart - what's strange is that the rat with "water weight" was only about 0.05 centimeters bigger than her thickest part, but once she swallowed fully, there was no noticeable lump (am I correct in assuming that the snake's muscles crush the ever-loving daylight out of the prey once it's down?). I also expected that the worst case scenario would be that she'd spit it back out before swallowing fully or, even worse, she'd regurgitate (which was not a fear of mine since the rat wasn't too big, but anything can happen....). thanks for answering.