Two to three hours of daytime surfing everyday for a week indicates to me that she's wanting something. My first guess would be food. My BP was an adult so I don't have any experience adjusting sizes, but I know they're fed hoppers as babies so it's probably time to size up. Get a weight on her and consult any of the numerous ball python feeding charts on the net to see what you should be feeding her.
It's probably unrelated, but I wonder how effective your UTH is through that much substrate. It looks like you've go two or three inches there. You've either got it running too hot or it's not doing anything.