Ah.
I'd think about seeking a second opinion.
Melissa Kaplan is an idiot.
Those symptoms are classic symptoms for an RI but I have never heard of them being associated with GI problems? The raised head and open mouthed breathing are known signs of an RI as well. Are there also traces of excess mucus in the waterbowl or smeared on the cage furniture? Can you hear any sounds when the snake breathes (move your ear from her head to the front third of her body to try and determine where they are coming from )?
Anyone every hear of a GI problem that did present with those symptoms?
I'm also curious why the vet feels it is necessary for it to be hospitalised and what carnivore care is exactly? Normally they just get a course of anti-biotics that you can be shown how to inject yourself.
I would imagine the hospitalisation etc isn't going to be cheap?
I don't know where you live but these links might help you find an alternative to double check the recommendations.
Link 1.
Link 2.
Link 3.
If it is a simple RI I would suggest getting a culture to determine exactly which anti-biotic would work best.
dr del