No reason to get too concerned just yet. Do you have a thermometer in her tank? That would be my first suggestion, just to make sure the temps are ok. Oh, and some garters just like to soak, but have you checked her well for mites? (sorry if this was covered earlier... didn't go back and re-read the entire thread) Mites would make her active and would cause her to soak. Just another thing to check of the list