I would offer a slightly different perspective, which is to consider the enrichment that she will carry with her for the rest of her life. It's not just about fun in the now or future "advantage." Same with a college education, you come out of it a different person, whether or not you "use" it in a practical sense.
It sounds to me like this opportunity is very high value in terms of enrichment. Of course, that has to be balanced against your particular family's financial circumstances. Considering your retirement and not being a burden on your children is also important!
