Hey, I just wanted to let you know that I came across this EXACT, to the tee, thing last year. The back end of this pregnant mother snake was smashed. She was still trying to creawl away with her top half. It was heartbreaking to watch and it made me cry. The fact is, that without a functioning back end, the snake cannot live, there are many vital organs down there, kidneys, digestive tract, etc that are now ruined and I suggest you do as I did and put the snake out of it's misery. Either put it in the freezer or decapitate it. Sorry you had to come to us in this way, perhaps you will find garters to be intriguing and maybe get one as a pet in the future!