I still don't see what the hold-up is with moving her to a tub enclosure. She is likely very stressed out from being exposed on all sides. It's time to make the snake's needs a top priority and not what you're worried the enclosure will look like. Tubs can look nice, I promise. For a baby as small as her, you'll want at least a 15qt tub, but I would do a 6qt and slowly move her up as she starts eating and has had alot of meals.

Let her rest a week(no bothering except to change water), go get a small live hopper mouse, pre-scent the room for about 30 minutes to an hour, and then drop the mouse in. Close the enclosure up, and leave the room, leaving the mouse in overnight.

What type of neurologic problem does she have? What symptoms does she have? If the meds haven't worked by now, then they aren't going to work. If she has a respiratory infection, then the vet needs to do a culture, have that sent off, and find out what antibiotic is appropriate to use. Why in the world did the previous vet use VAL syrup??