Thank you Remco. I knew the name of her (Dora Hirsch) parents. They lived in Jüchen. But in 1866 Mrs. Hirsch gave only birth to Bertha Hirsch on the 29th of August. I am convinced that Dora Hertz, nee Hirsch, was born in Jüchen (Rhineland). But there is no evidence.
Thank you again for your efforts, Remco.
Best regards from Jülich
Heinz Spelthahn