First off, you sound like you need a hug, and a friend to pray with you.
Second off, my first piece of advice is chill. I mean it... just relax, and listen to her. The more you listen to her talk about this the more you’ll learn her feelings on it. Sometimes the hardest thing to do as a parent is just sit quietly, and let the fear rage on the inside only. My second piece of advice is. She needs her dad. Girls need to have quality time with their dads. Some ideas would be coffee dates, movie dates, ice skating, since the holidays are coming up they could go out to shop for fun decorations for her room. Or maybe start making a pack to go to confession once a week during advent. Get those graces up! Also, family advent candle lighting. My husband is new to the whole practicing faith thing, but I started since we were married having him say prayers on all Sunday’s during advent (or lent) when we light the candles. It’s amazing bonding time for the family. He needs to make all his time pressure free, and not make this issues the center of “date.” Just act natural, and talk about God, His love for us, what He expects from us. Family catechism study is another good idea. Third, just pray, and monitor what you can at home. Watch the internet, watch the phone, watch the tv. There are some great routers that will give you files on all the families search websites including the ones that are in the hidden browser. Please, talk to your priest, and get support for your family. You can do this guys! She’s only 12, and that’s not to late to Guide her!