Yeah, this whole situation sucks. She's got this thing now where she gets mad if anyone tries to give her advice and comes back with "I'm an adult, I'm old, and I just want to have fun", then goes off and gets drunk, gets roped in to abusive relationshits, and acts like a teenager. Anything me or my sister says to her is written off as overstepping our boundaries and trying to bully her into being unhappy and alone.
I get it, I don't want people playing mommy over everything I do, either. But it's like she hates herself.