15 year old sister talking to herself, what should I do?

Jade_kaves
I have a 15 year old little sister who talks to herself ALL the time. Not only does she talk to herself but she answers back. One day i was getting ready to go to my boyfriends house and she was just standing in the middle of her room talking to herself. (She's been doing this since she was 5 years old.) I walked in her room and called her a weirdo and she said that Bobby doesn't like me. (I'm guessing the person she talks to) Then last night I walked in her room and saw her on her bed rocking back and fourth. She yelled at me and told me to get out before Bobby kills me. I walked out of her room and called my boyfriend and told him to come over. He came over and we were talking in my room about her. (whispering) She comes walking in cussing her head off. I've told my parents about it and they just blow it off. My boyfriend thinks my sister is crazy and I'm starting to believe that myself. Now i watch a bunch of movies and I'm literally scared for my life to the point I've been staying with my boyfriend. My parents refuse to take her to a counselor. So as her big sister I fell that I need to help her.

Do you guys think I'm just worrying to much or do you guys think I should try and find someone to help?
15 year old sister talking to herself, what should I do?
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