I second the idea that she's just getting used to her new home. As long as your husbandry is spot on, she's just a little stressed from the change in scenery. I only see my BP on the hot side after they eat or if the room is a little too cool. With my ambient temp around 80, they generally stay on the cold side unless they've eaten.
How big is your tank? If the tank is too big, that could also be a reason why she' exploring and roaming.