I am somewhat Bad With Money, my little sister is Very Good With Money and we had two different uni experiences.
Both of us:
Full loan. No other state assistance. Parents paid tuition.
Me:
Paid rent with the loan and got a job, working 2-4 nights a week. Until I got a better job in a department store and did every Sat and Sun.
Very occasional £100 was lovely.
I went broke a few times throughout my time at uni, but not dangerously so, and it gave me a good appreciation of how easy it can be to waste something that you worked hard for if you get careless.
Sister:
Parents paid rent. She saved loan. Lived very frugally, no job.
My favoured approach would be to take care of her housing and tuition and leave the rest up to her. I think though it depends on the relationship. I've always been very independent and wouldn't think of asking my parents to take care of my phone, clothes or food bills, I'd rather earn my own money and struggle through. My sister prefers to take assistance, knowing that she is easily organised and conscientious enough not to screw it up.