I'm writing a story featuring a surviving Princess Johanna
. With people like Johanna you have virtually a blank slate, but, for example, you can extrapolate from the actions of her parents that life for Princess Johanna in post-war West Germany would not be easy.
Why? Simply having been a member of the Nazi party was nothing to worry about in post-war West Germany. People far more involved in the Nazi movement were also more or less rehabilitated. E.g. other royals in the federal state of Hesse: The Hesse-Kassels and the Waldecks. The only slight royals with a Nazi past would experience was that they were shunned by their reigning cousins, i.e. the monarchs of Britain, the Netherlands, Norway, Denmark etc.
I think it was more likely for a young Hessian princess in post-war West-Germany to be caught up in the semi-fascist jetset society in Franco's Spain than to involve herself in the movement of the Heimatvertriebene. As a Hessian she would not have any relationship to the Prussian eastern provinces, unless she became engaged in the cause by having refugees lodged (by the state, against her will) on one of her properties and getting to know them. But she might very well be vehemently anti-Communist and thus anti-DDR and pro-Franco.
Of course a princess from a former reigning family would have a more cosmopolitan outlook than a countess from the rural hinterland of Holstein, but to get a feeling of the life and mores of the nobility in post-war West Germany I highly recommend
Mitteilung an den Adel by Elisabeth
Gräfin von Plessen.
