She thinks it's unreasonable and is throwing major strops over it.
We're in Sweden so she gets a student grant and can top this up with a student loan. Tuition is free. She is entitled to a student flat from the local council. These are really nice flats and the rent includes all bills, even internet. She however wants to live at home and commute each day to save money. By 'save money' she means live at home free of charge, eat all our food, use mum's free taxi service etc so that all her student support can be used as spending money to go and visit friends abroad. 
So AIBU to charge her rent? And if not, how much is appropriate? I was thinking £200 per month as rent on a student flat is £300 per month and doesn't include food. (I hope suspect that if she has to pay her way she'll be off like a shot)