Any coin is suitable for kids. It is easy to understand. Not very complicated although it may take time. But its ok. Try to be patient with your kids and they will soon understand how to use it properly. I do not remember how but right now, I am able to use fiat money without any problem
If you wanted them to learn as early as it's age, better to add more patience and make sure to bring some sample that's really understandable or suit to them.
Crypto is not something that they can just learn in a short period of time, giving them exciting and entertaining examples that may
attract their interest.
Work with your daughter in a fun way but make sure that responbilities are well noticed, it's money / financial venue making them
involve as early as now will give them huge advantage.