The doctor said there is no point in testing for IBD and that the snake should just be sent back to the breeder. There was nothing I could have done to make the snake exhibit this condition in the time frame that I had it.
If a vet ever told me that there is nothing an owner could do (re. husbandry or other), to cause a snake to be in that condition within a day (or, especially, within a couple of weeks), I would be looking for a new vet!
Now to comment on a few other things.
There is a big difference between dry skin and dehydration.
A snake, that is, in fact, dehydrated will not have its skin ~instantly~ gain its elasticity with a simple application of water upon its skin.
Perhaps it could work for some external dryness, at best, but not for dehydration.
A dehydrated snake will, also, (as some others have mentioned) not pass urates within a minute of putting a drop of water into its mouth ... or was that 3 drops into its mouth?... or was that tubing it?... or? ... story keeps changing.
No matter what, tubing is always stressful to a snake. I will not "bash" the act of tubing water, into a snake, because, sometimes, it is helpful (~only where it is truly necessary~). It is best, though, if it is done subcutaneously.
However, it can also be a detriment if tubing is done improperly. Also, I think that, in this case, it was very unnecessary (at the least end).
For you to say that it is more likely for an alien to have caused this, before it could be due to a "bad" mouse, is absolutely ludicrous. A mouse actually could come into contact with "who knows what" that is toxic to a snake. Heck, I even know of one gal whose snake was seriously/negatively affected by a mouse that had a piece of metal wire (cage diameter wire) on/in it!
You are right, a Boa can harbor IBD for a long time. However, a Python cannot. In a Python, it will show itself, rather quickly, and the Python will die in short time. Also, since your KB is being "quarantined", in the same space as your other new Ball Pythons, it would be unlikely for the others to show no ill effects (of contracting it) if the KB did, indeed, have IBD.
The snake appears to be exhibiting neurological problems.
Could be the Spider gene at play or it could be due to a number of other things besides IBD (i.e. poisoning, overheating, etc.).
I have seen snakes exhibiting similar movement/condition from overheating, stress inducing a genetic neurological condition to worsen (oftentimes improving, over some time, and sometimes not), a retrovirus (which is not the IBD virus), poisoning, etc.
While there is no blame, for you to consider IBD, it is reckless, at best, to instantly throw out a claim, of IBD, unless it can be proven. It is also reckless, and narrow minded, to not explore other possibilities.
Personally, at this point (from what I have seen/read, & without further info/facts, & although there is the slightest chance I could be wrong), I do not believe that the snake had a preexisting condition (aside from the Spider gene) and that the problem started with, &/or lies with, you (or something that occurred at your location).
Whatever the case, I am hoping the best for this snake.
I also pray that you will rein yourself in enough to look at things with an open mind and a clear head. All possible scenarios should be looked at &/or considered (yes, even your husbandry).
Take the advice/suggestions given to you and explore them.
Plus, for pete's sake, please quit handling the KB so much. Am sure all the handling/video taping/etc. is doing her stress level no favors.