^^^ Conversation already been had.

Time for them to understand the value of money and cost of living.
Actually, it went something like this:
Daughter: I don't really need the money, I don't think I'll apply for it. (She'll get it automatically, but didn't realise that.)
Me: That's fine, your choice. By the way, I'm transferring your mobile phone plan into your name tomorrow, and starting next week you're paying $X a week board, and paying for all your own clothes and entertainment. You should have enough savings to cover that for a while.
Daughter: Oh, um. But how will I afford to buy my friends birthday presents?
Me: If you really can't afford it, they'll understand. I'll let you figure it out.