I know. Mine didn't / couldn't at first, either. She would automatically switch out. Staying and learning different things took a loooooong time. You describe her doing something new at the therapy session - trying to go to the bathroom, and her feeling of contentment / acheivement at her effort. That feeling of contentment IS something different to the anxiety. THAT is how change happens. One. tiny. step. at. a. time.

Next time she might be able to try something different. Or mabye not next time - maybe it will be a little while longer before she is ready to take another step. Still, it is all part of the process of learning new things and developing new skills. The hard thing can be wanting things to be different all at once, when the reality is that change often takes a really long time.