I screwed up :(

I am 12 years older than my sister. We have the same mom but different dads. She's 16. I was 12 when she was born and I helped my mom raise her. Well now she lives with her dad in the same state where I live with my husband and kids. Our mom lives 2 states away.

So she lost her virginity to some punkass 18 year old boy. He sells drugs and sleeps around. I took it upon myself to say something to this kid. And now she's mad at me and told me to stay out of her business. I was just trying to help.

What can I say to her to make her not mad anymore???