Financial help for DD

I should have said we bought them a house for cash ,so the only mortgage payment was the one on our home .

If you can afford the interest, an equity release interest only mortgage but pay the interest rather than let it accumulate. Then at a later date, when your DD is more settled and can afford it, she can get a mortgage herself for the £30,000 and repay you.

When we wanted to do this for a S we took out a mortgage on our house which we paid back in a short time, not equity release, a normal mortgage.

Good morning Nanny. The obvious way to raise that amount of cash would be equity release on your property. Is your daughter an only child? If so she would simply be getting the benefit from your house earlier than anticipated since presumably it would pass to her eventually?
Other GNers will come along with other suggestions I am sure.
Good luck hope you find a solution