Depends on the kid when their maturity kicks in. It may also be that she has friends whose parents were MORE permissive so she doesn't see her choices in the same old light.
While I told my mom when I was 19 that my friends and I were going to Canada for a vacation, it was my money, not hers. If your daughter is "grown" enough to skip class, then she's also grown enough to buy her own pizza and to pay for her classes. She's not 15.
My SS got a scholarship, so DH feeds money to a joint account to cover what the scholarship does not. His freshman year we had to talk to him about how that money was also to buy his soap, shampoo, vitamins, etc. He was not to come home on breaks and put his toiletries on the grocery list and expect us to pony up. Sometimes we did (like the start of the year) but most of the time he was on his own and if he had to use a brand he didn't like, that was his budget.
Anyway, I think it's not cut and dry, but I do think that if she insists on making decisions, remind her to make informed and adult decisions and not just go forth willy nilly because things like skipping class have consequences (for example, profs who only allow 3 absences unless you're dead who will FAIL you for your attendance, or not being able to miss class when you have the plague because you skipped out early one break). Don't lecture, but let her know that the results are hers to live with. If she makes poor choices, you are not bailing her out. If she fails, she pays to take it again. Her OWN pocket. I had a roommate who failed a basic music course something like 4 times for lack of attendance and homework. I was stunned that her parents continued to pay for it.
I don't really know more about SS's schedule other than he has 2 late nights and 2 early ones and one semester he went to Europe, but DH does ask about his grades and SS knows we do NOT pay for Fs.
There's also a fine line when they are home. SS has to remember he's not in a dorm. It is polite to call and say, "I will/won't be home for dinner" and not first say "What's for dinner?" like the food offered at home will depend on whether or not he graces us with his presence. If he's gone to friends' houses, or to campus, that's fine, but give us a head's up if he's expected to be living here. Last summer he had a portion of the break where he reverted to being 16 and I about set him out for wolves. I don't care if he's out all night, but make a plan and convey that plan and stick to that plan. My mom's rule was if I was out all night, I had to tell her by 10PM and she'd put the chain on the door and go to bed.
More recently he came home and asked me to make sure the washer/dryer were free. Um, no, YOU do that. This household still runs when you are not here and I won't let your sister wear dirty clothes because you want to save a few quarters. If you want to also run laundry, you allot yourself more time instead of making it an emergency for us.
It's a tough transition time, but it doesn't have to be a battle.