Actually, she doesn't seem to be working much; as usual she's having her picture taken--her main activity during WW II. But she IS in her actual nurses uniform, and I don't have many pictures of her like that.
The big mark on the photo is the mark from where I removed a staple. My father's idea of aesthetics was to take pictures and put them in a photo album by putting a whomping big staple through the main part of each one. (I swear if I didn't look so much like his side of the family I'd think I was adopted.)