It's a funny coincidence (?), but I wrote some information about the photographs of/by Isabella on an other thread (Royal Palace Budapest/Habsburgs or sg. like that), so I just copy/paste my reply from saturday for those who are interested:
"By the way, the most interesting photographic documents of (other) "Hungarian" Habsburgs are the pictures from the family of Archduke Friedrich (1856-1936) (from the Teschen line - I mean the line of Archduchess Maria Christina, daughter of Maria Theresia and husband Albrecht von Teschen). His wife, Isabella, princess of Croy was a talented photographer, who documentes almost every moment of their everyday life in their residences in Féltorony (today Halbturm, Austria) and Pozsony (aka Pressburg, today Bratislava, Slovakia - this palace was built in the 18th century by the Grassalkovich family - the builders of Gödöllö, now it's the residence of the President of Slovakia).
At least 150 photos are published (there's a Hungarian and German edition):
Ein Photoalbum aus dem Hause Habsburg / Vilmos Heiszler, Margit Szakács, Károly Vörös ; Übers. v. Therese Töttösy, Budapest, Corvina Kiadó / Wien ; Köln ; Graz : Böhlau Verlag Gesellschaft m. b. H. und Co. KG., 1989
ISBN: 3205051971
(Copies are available online for 20-27 Euros; but here in Budapest copies of the German edition are usually appear on booksales for less then 3 Euros ) "
So the best thing to do is to get the book, or I can scan some (or all) of the pics...