The photo is taking in connection with the Austrian State Visit to the Netherlands in 1961. Seeing that she has been awarded a rather high grade of the Austrian Order she must be someone quite high up in the echelon of the Dutch Royal Court.

The Grand Mistress (Grootmeesteres) at that time was "mevrouw" G.J. van Wickevoort Crommelin. Now, whather the lady in the photo is the Grootmeesteres I don't know and I have no knowledge of the Wickevoort Crommelin family. But I think it is likely her given the closeness to the Royal Party in this photo.