Every one has their fundamental human rights so it's important that you respect them because the truth is that you don't expect your child to always listen and respect you so when a child gets to a particular age you have to less your grip on the child as they will start taking decisions on their own so respecting the decision of your child is important.
How ever it's important that you have to know that gambling is not ment for people who are under the age of eighteen so before you allow your child to take decisions on their own especially when it comes to things like gambling which pose a threat to the destiny of the child you have to be careful and should allow that child to engage in gambling only when the child has grown up to the age of eighteen and above
Gambling is a choice and when a child has reached the age of accountability, you don't have the right to question the child anyhow because he has reach a level in life when they can now make decisions for themselves.
If your daughter chooses to gamble, then their choice and you need to blame yourself because you allowed such thing to happen since you never caution him.
There are age limit to gambling and for a child to choose to gamble, then they must have gotten to a stage where they are being ignored for no reason especially when the parent care is not available or sufficient enough to protect the child.