Edit: I should say, she's actually pretty on board with the rich/corporations fucking up the world, but she blames black people, poor people, immigrants, young people, for their problems instead of seeing the larger implications.
Maybe a specific episode of Chapo, Citations Needed, documentary, etc, whatever, she's what I would call a very conservative lib
"Why socialism" by Einstein is a good place to start. Possibly some episodes of Richard huge dick Wolff to make her understand capitalism fucks all of us.
I'd suggest bringing her to acknowledge the fact a lot of super popular figures in the US were/are libwashed, like MLK for example.