Which means it’s your kid’s money.
The money is “paid” to you because you daughter is a minor. If the money is spent, it must be for her benefit. You are acting as a custodian or trustee, with a fiduciary duty.
A 529 account can only have one beneficiary. I assume you mean that your daughter is the beneficiary and you are the account owner. In my opinion, the 529 account should have been set up as a custodial account, meaning you are the custodian with control of the account, and can decide how the money is spent (but only for the benefit of your daughter) until your daughter reaches the age of majority, which varies by state (usually it’s 18 or 21). Once the minor beneficiary reaches the age of majority, the custodian turns control of the account over to the beneficiary.
It is her money, so it’s right that she should have control over it when she reaches the age of majority, no matter what kind of account or investment vehicle the funds are in.