Can we draw the following hypothesis from the context?

Context:

Marie Hedwig Auguste of Sulzbach (German: "Marie Hedwig Auguste von Sulzbach" ; born: 15 April 1650 in Sulzbach; died: 23 November 1681 in Hamburg) was a Countess Palatine of Sulzbach by birth and by marriage, Archduchess of Austria and by her second marriage, Duchess of Saxe-Lauenburg.

Hypothesis: Marie Hedwig Auguste of Sulzbach was the only Archduchess of Austria.
It's impossible to say