That's what I figured as well. It's apparently bothering her... Not a day goes by when I have at least seen her repeatedly try to get the skin off the top of her head. She'll play with the wood structure in the environment and actually scrape back of her head against it over and over and over and over... To no avail. That's the first, and only, time I have ever seen a snake do something like that... But then again, this is the first time I've seen this issue, as well.