My bestfriend is a hoe . What should I do ?

Ok , my bestfriend is 15 years old . She lost her virginity at the age of 13 . Ever since she's been getting it in. She had 8 partners in the last year . One of them being Todd Mayo , OJ Mayo's little brother . She has had 12 or 13 times within the last year . I try to convince her to pray and ask for forgiveness but she doesn't want to take my advice . I feel bad for her , but it is her fault . She sneaks behind her mothers back & does alot of illegal things . Idk what to do ! Can I please get help :)