Pray for Andrea

My sister recently fell into sin. She meet a boy at her high school and things went spiraling down after that. Sin was very tempting to her and she started lying and missing school. As a family we've tried to intervene and help her; she would accept help and ask for forgiveness every time but we 2-3 weeks later we would find out something else. We had found out she lies really really easy and she fabricates big big lies around very little things. Recently we found out she committed sin by having sex with this boy. Please my family needs prayer for strength and protection. We need Jesus to light the path as to what do do.