I think if Elisabeth if attends school in Belgium we would see her often with her parents in official duties.
I think sending her to the place in Wales for a couple of years is a good way of building her language, leadership and diplomacy skills in a safe environment, yet still being just a couple of hours from Belgium if she gets homesick or has a piano recital to sit through.Apparently Wax of NL studied there, and Queen Noor and Prince Charles are its patrons. It also pretty much sets her up to go to Oxbridge or Ivy league once she gets to 18.
It will be interesting what her education post the age of 18 looks like. University is a given, but will she do military training, too? Take a gap year?
Tbf, her decent alone sets her up for any Institution she would like to join. She could attend a tree nursery for primary education and still be found eligible for Harvard, Cambridge or the MIT. Just depends on the contribution the family and the institution see fit.
And sure she will be doing a charity gap year, it is fashionable today, almost expected in certain social stratas and "gives the world so much back"...