I would have asked to talk to a manager. Any beginner reptile keeper can see that she is having shedding issues, and any NORMAL human being will know that keeping ANY animal with no water source is extremely inhumane.
I would have talked to a manager and expressed my opinions in a very polite, yet firm way. Maybe if there is a reptile or herp club in your area you could bring this to their attention and they may possibly know some different avenues to explore with issues like this.
Makes me extremely sad and disappointed in the human race to see animals kept in conditions like this.
And no healthy snake should shed twice in two weeks