Sounds like it is due to the time of year, mating season is coming and I suppose she may have "an itch to scratch" like most animals wanting to breed.
It´s built into them like any other species.
Other than that she might feel too insecure if her tanks not covered in at the sides.
Just move her water into a more central position.
I keep my tanks hot 85 to 90 but I keep the humidity at 50 to 60...no higher.
One area of the tank is very wet moss so they can dig it they wish another moist soil...then there is a water tray.
Night time goes down low to around 70.