I agree with what strawn has said.
One other consideration - I don't know what happens to the personal allowance if you pay 100% of your earnings into your pension. You will get tax relief in the pension but you won't have paid tax on that money. I don't know if you "win" in this circumstance or whether you end up having to pay it back to HMRC.
One other thought - you might want to consider just giving her the money to put into an ISA instead. Although you won't get the tax relief up front, you also won't get taxed when you take it out. The way things are going, your daughter will get 20% relief putting the money in but by the time she retires she might be paying 30 or 40% taking it out again. Additionally, she'll potentially have been paying 5%+ on a mortgage (after income tax) while earning 5% or so before tax in her pension. So she might wish that the money wasn't tied up quite so tightly!
There is no "right" answer to pensions, but my personal opinion is that it's rarely worth paying money into a pension unless a) you'll get higher rate relief on the contributions or b) you're so close to retirement that you can be reasonably confident that you're actually going to see some benefit from that 25% uplift in real terms.
On the other side of that calculation though, I believe that a) pensions are not counted towards assets during benefit assessments (but bear in mind that most wealth tax proposals do include pensions) and b) you cannot "fritter it away" until you're at least 57 (probably older by the time she gets there).