My prayers are with you. My younger son and his GF started having sex when she was 17, he was 16. She actually pursued him. She was on the pill, supposedly to regulate her periods…well, we know what THAT encourages. He would not listen to me, although like your daughter, he avoided Mass for a long time, though he would not say it was because of that.
It took a very long year, but they eventually broke up, very painfully. My son was shattered, just in pieces. He didn’t even go to school for 2 days. He learned that I knew what I was talking about. I would not wish that kind of pain upon my worst enemy. He is a tender hearted young man and the breakup really hurt him.
There is no good way forward. Make sure your daughter is aware that even with the pill, she could get pregnant. What is her plan then? That is when a young woman will feel trapped into having an abortion. She didn’t want a baby, she was trying to prevent a baby, but a baby was created. Now what? Have her think over that plan. Give her the stats, it really does happen.
We moms and dads would love to save our kids from all that experience they get themselves into, but there comes a time when we have to stand back and let them feel the pain and learn.
You will be in my prayers.