Hi,
Chances are it's not getting hot enough and seeing as how it doesn't have a hide it is probably stressing out. I'd change the cage decor. The snake couldn't care less about living in a "natural" environment. With young snakes..simple cage furnishings is all that's required. I'd get rid of the woodchip and replace it with paper towel or newspaper so the warmth of the heat pad gets through. I'd also get rid of the plant and replace it with a suitable small hide. I'd attach a piece of dowel across the enclosure for it to perch on. Leave the water dish. Try this and see how it goes. Also should mention not to handle it a great deal until it settles in.
George.
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PS. Feed it hopper (just weaned) mice. Pinkies are to small for a snake this size.