She's a block captain who spent election day volunteering at the polls. She's a mom and grandma.
And every day, in the hours in between, she's on the frontlines of the COVID-19 pandemic, as a school nurse with the School District of Philadelphia, emergency room nurse at Einstein Medical Center, and tester with the Black Doctor's COVID-19 Consortium.
"The people need us and I'll continue to do this as long as there is a need to have it done," said McMillan.
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The consortium was started last spring by Dr. Ala Stanford, who saw a need for more testing in Black communities where COVID-19 infections are still disproportionately high. Shelah offered to help.
"She said definitely and bring whoever you can, and from there it's history," said McMillan.
Three times a week, the consortium holds free COVID-19 testing, and now gives free flu shots too, in disadvantaged communities in Philadelphia and the suburbs.
"What I need for people is to get educated about it. Get tested, know your numbers, know your status," she said.
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McMillan has helped run testing sites in her neighborhood too at places like Second Macedonia Baptist Church. She says through this pandemic, it's important people see a familiar face they trust.
"She's just a special person, in Christ," said McMillan's neighbor, Annie Alston.
Always the helper on her block, McMillan is now a hero for thousands more, but she doesn't see it that way.
"I'm Shelah, I'm mom, I'm nunni, I'm the neighbor, I'm the block captain, I'm just me," she said.