My 12 Year Old Sister is going to Terrorize the Abortion Clinic!?

My sister is 12 years old and got pregnant a couple months ago. Today she went to the abortion clinic to ask for an abortion. When the clinic asked why she said she is moving to LA soon to try and become and actress and doesn't want to have a baby belly at her movie auditions. The clinic said she couldn't have one because she was too young and needed parental consent. She doesn't want to tell our parents so she started cussing out the lady and threatened her. The cops took her home and she told me the story and now she wants to extract revenge. My sister is going to march over there with her gun, shoot the clinic secretary and burn down the clinic. I'm afraid she might get in trouble if she does this so I tried to stop her but she threatened to shoot and beat me. I think that if I take her car keys she wont be able to get to the clinic because it is 10 miles away. Should I do this and risk getting shot?