The headline is really misleading. She now works for Costco corporate doing marketing training. The typical store employee is still around $18/hour.
Downvoting you, because you are mischaracterizing the article content.
The first half of it describes how she started there and the regular positions she had, before she moved up and into the teaching position she has at corporate office, which is similar to the teaching position she had before; both are of a teaching.
From the article…
At first, I made $18.50 an hour — a little less than what I earned as a teacher. I put in 40-hour workweeks, five days a week, and got a $1-per-hour raise when I hit 1,000 hours.