The point is that you should not be concerned with education at all. 18 years from now bitcoin is the standard and it will be very easy for her to know what to do. The only instruction is - keep it extremely safe.
Discussion
Not all countries will adopt a bitcoin standard at the same time and if they do, will they educate their people about bitcoin in the right way with self custody... or will they teach them to buy only regulated ETFs with banks and make bitcoin in self custody illegal for individuals.
Of course, anything can happen. She will have to figure it out 18 years from now, there's nothing we can do.
One potential issue is quantum computers. If that happens, meanwhile, she needs to call for help from someone (I'm assuming we are talking about a child, or she won't study bitcoin in the meantime).