My daughter snuck out and was punshed?

She had a friend over and when I checked her room they were gone. I called her phone and left her an angry message that she better call me. She called me and sounded VERY scared. She said she'd be home but I insisted I'd pick her up. She lied about where she was but when she knew I was coming she told me the truth. She was at a guys house with a bunch of male and female friends and they were drinking. I confronted the boy who lived there and let him have it verbally. Anyways I yelled at her, slapped her across the face at least 5 times hard, I took her brand new iphone she got for Christmas 1 day earlier and grounded her indefinitely. She got in trouble once before about 2 years earlier shop lifting, but she's otherwise a good kid. She gets A's and B's in school and never had problems in school as far as behavior. BTW when she was busted for shoplifting she was punished severely. The case worker said I did more to punish her than he's ever seen any parent do. It hurts me more than her when I slap her but I just don't know what to do. I'm not against corporal punishment, but I love her and it hurts to know I hit her that way. I feel like a failure as a parent when these things happen. We're a working class family and are not drug users or have no family dysfunction otherwise. Any ideas or advice on what I can do to keep her on track or how to handle this?

You need to speak(firmly) to her and tell her to be honest about what's going on because you can't fix it anyway else she's going to carry on with the drinking and shoplifting if you don't.

Sit down and just talk to her. Camly take away privilages, not forcefully. And please, never, EVER, slap her. That's going to scare her away from you and you won't have a good relationship. I know that you're trying to be a good parent, and that's great. But take it down a notch.

Maybe stop the slapping that's makes her feel unequal and lesser so that's bad and she's just going through a rebellious stage there's an underlying issue you need to find out what that is first.