How do I go about this issue?

My sister, 16 yrs old, is a mive Rage Against the Machine fan, which is fine, Tom Morrello is a fine guitarist. But, heres the issue, since she got into them she has started supporting, and educating herself on communists like Che, Malcom X, Fidel Castro, etc. She's filling herself full of hate towards people. Malcom X was a gang leader, drug lord, hate mongor, and my sister likes him. Her room is plastered with commy things like pics, red stars, upside down flags, etc. She says she wants to change the world. She thinks Communism works. She hates America, she's going crazy. What do I do, what are some points I could bring to the table. We are Christian Americans, not muslim commies.