https://www.mdvip.com/about-mdvip/blog/which-type-face-mask-can-protect-you-covid-19
https://www.cdc.gov/coronavirus/2019-ncov/hcp/respirator-use-faq.html
The biggest argument against the general public wearing N95 is that it reduces the supply for medical professionals. But again, if her goal was to protect herself, as it rightly was, she was wearing the right mask.
On the topic of hospitals and masks, I was at a hospital as the driver for a relative having a procedure. I walk in with my mask on, they take my temp, we go to the department for the procedure, I immediately notice to people in the waiting room with their masks worn below their noses. I told the nurse, "I'll wait in my car, call me when they're out of recovery"
But I don't get mask wearing according to Shaun because I understand what mask protects the wearer and what mask should be worn to reduce the spread of the virus.