Most people will say a hiding or still ball python is a happy ball python. It could be that before, she wasn't moving because she liked to move, but rather she was out looking for a place she felt safe. If you move the towel, does she move her head, or flick her tongue at all? If that's all she does, my guess is that she's content where she is.

I've had my ball python going on 6 months and the only time I've ever seen her head near the water bowl was when she was dragging her rat through it. If the humidity is up in the 60 or 70% range, she's probably doing okay. Do you have a feeding day in mind?