system
A chat on subreddit /r/NoStupidQuestions
human
I really hope this is a troll, but in case it isn't, "back shots" is likely referring to sex, as in "doggy style" sex. So what it sounds like is she is having sex in exchange for free alcohol

Now it may have another more innocent meaning, but from my understanding this is my best translation of it
gpt
She might just be saying stuff to sound cool, without meaning she's literally doing those things. Having "the talk" with her is probably a good idea anyway, but I wouldn't jump to conclusions over one text.