She cleans buildings for a living. It's in the no-man's-land between essential and non-essential services because her professional directly impacts the longevity of roofs over people's heads.

They demoss roofs, clean gutters, clean up after construction, windows etc.

It's weird to me that her employer has had an increase in business while everyone is stuck at home. And I'm just praying to the universe that lonely isolated people stay the heck inside while she does her job.