Is it wrong to discipline my girlfriend for coming home late?

My girlfriend was at a friend’s house and was supposed to be home at 9 but ended up staying until later and her friend brought her home carrying her and she was not sober.. Her friend mentioned how her older sister was over and there was drinking going on and my girlfriend is only 18 and I am 19. I am a bit pissed off that she was drunk but also glad her friend brought her home before she was taken advantaged off. I ended up putting my girlfriend’s hair up, removing her skirt and her top, and carrying her to our bed so she can relax and wake up feeling good. She seemed to be really really drunk and saying a lot of stuffs to me. She has finally fallen asleep but I want to talk to her about this. I don’t want to spank her since it would just hurt her.

Is it wrong to discipline my girlfriend for coming home late?
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