Well I am very happy--no, I'm delighted to report that Snaky is rapidly returning to her old self again, and is recovering just fine from her frightening experience about which I started this thread.
Part of her weird behaviour may have been coincidentally that she was starting to prepare to shed around when this event occurred, and she has now shed successfully.
She was quite active and curious this morning, paying a fair bit of attention to my hands, which is where she knows the food comes from
I had her out for a few minutes this morning, and she was quite at home with me, and she's since had a nice big Sunday brunch consisting of a pinky mouse and a half-dozen worms!
When I get a bit more daylight in here later, I'll try getting a couple decent pictures of her up on her warm rock, so you all can see her.
And thanks to everyone for their interest and advice.