GOV.UK says
we'll charge you interest on your loan, as soon as we make your first payment. While you're studying, we'll charge you interest. Your rate is linked to the retail price index
So how much is the interest rate?
If DD gets £9250 plus £4650 = £13,900 how much interest will accrue over 4 years of study.
Then when she's working and earning above the £25,000, she'll pay 9% of her income (over threshold) and interest will keep being added on. For 40 years. Is that right?