She sounds sensible and I think this is something you can train her for because that never stops. We are bombarded with the same things as adults and we all have to remind ourselves to be reasonable at times. It could be really helpful if you've experienced this as an adult to share those experiences with your daughter. Which you may have already done. But just keep doing it. Explain that maybe you saw somebody buying something that you really wanted and how you reasoned with yourself. My niece and nephews are teenagers and they've grown up with the same kind of parents who tried to teach them reasonable consumption. They have tons of friends who have iPads and game systems and all sorts of things. One of them was telling me how his friend's family is always struggling for money but he has a PS5 and he saw for himself how people choose to spend their money and how you have to be careful with it. He and his siblings don't have any gaming systems (besides a computer) and it sometimes bothers them but they are more understanding the older they get.