“I don’t know anyone in the St. Louis area who can live off of $7.70 an hour”
They are not supposed to. Minimum wage jobs are for minimum skill employees, aka teenagers.
“I have no problem working for it,”
That is a lie. If it were true, she would have another job (When I was a minimum skill employee as a teenager, I had two full time jobs, 7 days a week up to 16 hours a day) or work for skills that would pay more.
“show up to her fast food job with a smile”
Kiosks don’t need to smile. If Bettie Douglas wants to keep her job, she had better stay cheaper than a machine.