Can you post a picture? Occasionally they will get a dry scale or a little scrape that can turn a darker color. Most come off with the next shed.

As for the pacing.. how often do you feed? Colubrids like to come out and 'beg' when they are hungry.

..also she could be wanting better hiding spots. Half logs are terrible hides. Get a couple identical hides that are small, low to the ground, and a tight fit for the snake. The plastic saucers for house plant pots are good hides with a hole cut in the side or top.