Miami-Dade police posted video of Sister Margaret Ann at work on social media taken by an off-duty officer who came across her.
Police said the nun was cutting trees to clear the roadways around Archbishop Coleman Carroll High School near Miami.
Sister Margaret Ann is the school's principal, according to its website.
Police saID "acts of kindness" like Sister Margaret Ann's remind residents that they're all part of the same community.
The department added in its post: "Thank you Sister and all of our neighbours that are working together to get through this!"
