The onlooker's video has been viewed more than 40,000 times.
A New Zealand Police spokesperson says it isn't uncommon for police officers to be affected by residual spray.
Thousands of people flocked to social media to view the video with some criticising the suspect and person who filmed the incident while praising the officer for her efforts.
"Something to be proud of... Not!" one person wrote.
Another said: "Good on her strong enough to carry on when anyone else would drop cry like a baby after being pepper-sprayed."