She is married to Maximiliaan Vrints Graaf van Falkenstein.
They got married on May 2, 1871, she was 19 years old.
Child(ren):
Bron:
Stamm- und Ahnentafeln, Johannes Hohlfeld, Zentralstelle für Deutsche Personen- und Familiengeschichte, 1940, Pag. 56
https://books.google.nl/books?hl=nl&id=_FAZAAAAIAAJ&dq=vrints+althann+1851+1900&focus=searchwithinvolume&q=%22Constanze%2C+Vesitzerin+der+Herrfchaft+Militschowesin+in+V%C3%B6hmen%22
The data shown has no sources.