It is no wonder she is having an especially bad shed if she ran out of water. She was probably dehydrated from the inside as well as just having dry skin. You might consider asking a different person to snake sit for you next time, since it seemed like this person didn't do their job.

The soak, combined with raising the humidity in her enclosure should help a lot, even if it did not produce immediate results. You might find that by the time a day has gone by, she has managed to complete the shed. You can also repeat the soak every day or two, if it is necessary.

To ensure she has access to plenty of humidity until her shed is complete, I recommend you put a humid hide in her enclosure. This is just a hide with some damp moss, paper towels, whatever in it. If you just add some to her regular hides, that will help a lot, but if you make a special humid hide out of a water tight container (rubbermaid food storage type thing), leaving the lid on but making a hole in it just big enough for her to comfortably get in & out, it will create a micro-environment where the humidity is very high.

When I got my first BP, it took quite some time before I had the humidity in her enclosure reliably stable at an appropriate level. It seemed like a tiny adjustment would make the humidity jump up or down 20 points or more (and yes, I was using digital, so in theory those readings were accurate). And then winter set in, so suddenly the humidity was way too low again and I had to start all over again. So she had a few bad sheds, and those humid hides seemed to really do the trick every time.

I'm surprised Heather (LadyOhh) said it would be ok to just leave it until next shed. I thought that if shed was left on that made a complete circle around the body or even just the tail tip, that it could cause problems. Is this only if it happens repeatedly? To be honest, that makes more sense to me, but from what I have read I understood that even one shed could cause an issue. Heather, or anyone else, can you shed some light on this?