Start by reading the care sheet Deborah provided a link for. Share this with the snake's keepers.
The snake is clearly underfed and likely dehydrated. Don't worry about the underwater head, it's drinking (yes, they do drink even if the owners haven't witnessed it). And possibly multi tasking by soaking that dried shed.
Since the snake is kept behind boxes in the basement, I feel confident it lacks a proper environment also. This is a snake that needs a new home ASAP. I can't imagine why the niece would object to that since she obviously doesn't care for the snake either.
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