Mackenzie says that when her former stepmother found out about High on Arrival, she vowed to do everything she could to discredit its claims. "She's either protecting the Mamas & the Papas brand for her own reasons, or she is having a textbook reaction," Mackenzie says. "She's embarrassed. [She wants to] sweep it under the carpet, protect the abuser. ... I don't have a history of mental illness; I have a history of addiction. That is not mental illness. I feel bad that Michelle would do this."