About the international school: it all depends if the GT school opens or not next year. If it opens, it does not make any sense to put DD for the rest of the year in an English speaking school, to go back in September to a Dutch one. As well, the international school has some admision procedure that takes some time, so by the time DD would be admited, the academic year would be finished.
But if the GT school doesn't open for next year, won't you be glad you went through the application process?
Grinity