I'm in line with Sofia. If something happens to me while dd is under 21, dd is provided for regarding living expenses, uni, etc. Trustee will have discretion regarding helping with a house/flat deposit, and other large expenditures such as a wedding.
DD will not see a lump sum until 35, more at 40, and final payout at 45. My thinking is that I want her to have a profession, learn to support herself, and to know what it means to earn, spend within a budget, and save money. Figure from age 35-45 she is likely to have high costs regarding housing, and possibly children of her own, and their education. So, there will be money to help out from my estate when her expenses should be at their highest. In my opinion, kids who inherit significant sums in their 20's don't know how to manage it, are more likely to squander, and also don't have the same motivation to work/earn.