Surfing... Meaning roaming around a lot? Like hunting? Maybe looking for a male?
If she's not looking for something then she's uncomfortable. Trying to get that perfect spot. Drop the temps a few degrees across the board as mentioned above. If she's still doing it then its probably the gradient between cool and hot sides. 78-80 cool side. 88-90 hot side. If its a new enclosure she might just be getting adjusted and finding that perfect spot. Play with the temps a few degrees at a time until she gets what she wants... If its not a male or a meal of course.