She's brainwashed by living in a Marxist echo chamber. Her friends, the Democorat Party, the media, schools and universities...they all repeat the same party line.
She's living in a Marxist safe space where she only hears the same message repeated over and over again. And she and people like her are instructed to never question the message. "Questioning the message is evil."
I apply the word stupid to the entire movement - Marxism is stupid.