"...If you could get me in contact with the Countess of Waldburg, I would really appreciate it"
You'll find her address and phone number at www.herold.at
Just enter Waldburg for the name and Rohrau as the place name. That site has an English language option, you'll have to select People Pages (not Yellow pages).
Have you btw tried to post to the Wroclaw message board like I suggested, or contacted the archives there? If there are any records there, they might help to find out more.
Best wishes for your search
P.S.: Please don't take to heart any replies you might find harsh or not as considerate as they usually are on this board. Hopefully you'll be able to make use of the information you get, whether friendly or not. You may also contact me privately, if you want to: Just click on my name to get the address.