Hello Jurek,
thank you very much for your answer and the internet links. I am surprised that the English Wikipedia contains much more information about Silesia and Poland in 1939/40 than the German Wikipedia. Well …
The information is sufficient to understand that my grandmother obviously became a teacher in Friedenshütte after (probably) the former (Polish) teacher had been kicked off or maybe captured or even killed … Sad Polish-German history …
So I can understand a bit more that my grandmother herself was in an internment camp in 1945 (as member of the German occupation authorities, I think) and deported to Germany in late 1945.
Tobias Kemper