Pancaking?

Miss Stormy stopped running and pancaked on her wheel when I approached her enclosure the other night. I'm used to pancaking in dwarves being a sign of comfort and relaxation, but with how nervous Miss Stormy has been, I'm worried it's a sign of stress. I have not seen her out much since then, but she keeps very nocturnal hours (2am-9am with episodic daytime appearances).

tl;dr can pancaking be stress related?