The bigger problem is she's not wearing a mask in a hospital environment
Submitted by iamnotasaint on Tumblr
I guess she is part cat so maybe that's what's going on. And she's smuggling water balloons filled with liquid medicine out of the hospital, that's why she's so shocked at being caught.
The real problem with this picture, though, is she's not wearing a mask in a hospital environment.
(DVD cover of Amazing Nurse Nanako, Radix Ace Entertainment)