Swallowed whole alternate ending: Stuck

The worm was almost to it's lair, it just had a few yards to go.  It slithered along, between boxes, crates and pipes, with poor Carla still writhing around in it's belly.  It began to slide through  the concrete pipe it habitually always slid through, and was abruptly stopped.  It pulled again, but couldn't continue through.  The worm didn't have the mental ability to realize that while it could slide through with relative ease, it's curvy meal was too large to fit.  It continued to pull even harder, which began to force Carla further into it's digestive tract.  Inside the worm, Carla felt something hard around her feet that was pushing her further into the worm.  She instinctively crunched her body into a fetal position with all of her strength to fight the worm.  It was her only play, she wasnt sure what was blocking her, but she wanted to at least slow the worm down.  The worm felt it's prey trying to fight against it, and began panicking at the thought of losing it's valuable meal.  It pulled and pulled, to the point where Carla was at the very end of it's intestinal tract.  It was then that the worm could turn it's head to see the problem.  It's small brain took several minutes of observing Carla's squirming form in it's body at the other end of the pipe to formulate a solution.  It  began the slow process of backing out of the pipe much to Carla's terror.  She tried to do everything to stop it, but Carla had no say in the matter.  It simply slid backwards out of the pipe, and used it's intestinal muscles to pull a kicking and screaming Carla back into the proper area for storage and digestion...