I’m looking for a middle school book, what would be YA these days, but they didn’t have YA in the 60’s, when I most likely read this book.  The protagonist is a girl, part of whose attention is focused on a night-blooming cereus cactus party that her family will hold on the night that the plant blooms.  Surrounding this domestic detail are the events leading up to the Anschluss and the threat that the Anschluss presents.