I used to work in banking, am a father of two, and have lived through the change of currency to plastic/internet/smart everything boom. My personal feeling and experience is that young ones need to first learn tangible/analog before convenience. If they are introduced to the easiest route and rely on it before they have an understanding of how the bucket first fills up, there is potential danger in their perception of money, value, work, and dependence values. Since opinion was asked here is mine: cash that is intended just as you do it. Maybe a food and miscellaneous amount per pay period/week (sounds like this is given and not earned or allowance). Keep it realistic and open to increase if she does extra chores or something. She sounds responsible which is already a great reflexes of you, so when it comes to finance and the danger of debt at young ages, keep the learning transparent and valid. She will better be able to make decisions that are huge in the future because of it. Even though you are in control of the card and keep tabs on it. “Free Reign”, can be risky for her financial development because there is experience and discipline she is missing in the big picture of how money enters our lives. She is at the perfect age to begin learning more about it though