The time between adventures helps with cooling off. She never wants to be fatally reckless again- she's already gotten so many chances, and she's not sure what it would take to break her out of stasis. So she's enjoying herself in one of her TARDIS' more entertaining diversions: a forest, rather similar to one she remembers from an early adventure on Earth. The familiar ache that accompanies those memories is easy to distract herself from with just how alien this one is underneath the surface. Her TARDIS gives her the best presents.