This might sound crazy and I don’t even know if it’s possible make your daughter a joint account holder to your US bank accounts and approve her as a signatory to these accounts but set a limit on how much she is allowed to draw each month if this is not possible then setting up a trust is the only other way but it is expensive as there are ongoing fees throughout the lifetime of the trust . Unfortunately you cannot control what happens once you have departed this world you say your daughter is 15 maybe talk to her regarding the importance of money and how to invest it for the future at her age I am sure she will understand . By the way I am in the same boat a couple of years younger than you and my estate will eventually go to my two grandchildren who are currently 17 and 15 they get an allowance from me every month and up to now I have never had any issues .