Am I a bad best friend?

Mary

So me and my bff have been bffs since 5th grade day 1 because I moved and she asked me if I wanted to sit at lunch with her. From that day on, we became best friends. Now, we are in 11th grade in HS and she keeps hoeing around and now she’s mad at me because I told her that I don’t like her being like that and I know it’s her life but I don’t want her getting an std or aids and die. You know? She doesn’t have any parent figures in her life so she needs someone to tell her. Now, she is mad at me. Am I a bad friend for telling her how I felt about her being a hoe?