If not in education they yes charge her rent!
I don't understand that, tbh.
She'll be on £5.90 an hour. A Student maintenance grant would bring in more.
It's much more sensible to wait to go on to University, if you are unsure of what you want to do. It's a hell of a lot of debt, if it's wasted.
My DD buys her own clothes, food and toiletries. I'm not petty, I get us a bottle of wine/BBQ food/take away, occasionally.
If she starts to blow her money on nothing, then charge her.
They need more support, longer, but it was common for Adult children to stay at home, until they married, in the past.
I'd encourage her to learn to drive, or at least get her Provisional Licence and work on the Theory test.
With mine, I also taught them how to build up a credit rating, that's more valuable than having to hand over money to stay in the room in what is supposed to be your Family home. My DD opened another savings account and didn't learn the PIN to it, she puts 20% away.
As said, if she's blowing it, then you could do that for her.