"They came about after the hurricane and were not mandated because no one was there.
"There were no public hearings, no choice," Mrs Harper Royal says.
She was open-minded at first about charter schools when she was asked by the Louisiana Department of Education to serve on the Recovery School District Advisory Council, hoping state control of schools would be a positive move.
Eight years later she says she was wrong. The state used Katrina as an excuse to push charter schools, and today 70 per cent of New Orleans' 40,000 children attend them. There were 65,000 children attending schools in New Orleans before the hurricane.
Mrs Harper Royal has urged New Zealand not to go down the same track of targeting lower socio-economic communities and underachieving schools.
She will speak at the Post Primary Teachers annual conference next week, with Education Minister Hekia Parata and Finnish educator Pasi Sahlberg.