This is quite normal, esp after the first term. You go a bit wild, drink too much, too many boys etc etc.
Me and a lot of my peers started having a few sneaky drinks, seeing boys, giving up sport/hobbies etc when we were 15/16 and still living within the "confines" of home, which gave some boundaries. So the fact she didn't do this til she was at uni is maybe telling.
Everyone over does it a bit in the first term/year, but I remember in the first term at uni, you could def spot the kids who'd had quite a sheltered life, as they really went for it!
To a certain extent, messing up and overdoing things is how you learn. Then pretty soon you course correct and find a happy medium.
Also, thinking your parents are embarrassing/wrong about everything is also par for the course when you start getting exposed to new people and new ways of doing things. I remember having a bit of a go at my parents about the way they made omelettes, because my new housemate did it a much better/fancier way. An omelette! My poor parents!
Also I remember going from freedom at uni to "rules" and being "treated like a child" when you're home for the holidays, was a hard transition
All that said, the rudeness isn't on though. I don't have much advice on that, but just wanted to say some of her behaviour is pretty normal for many uni students. And most turn into completely normal adults!