Agathe Wehinger was indeed Pauline and Albert's niece. She was the first daughter, born 1853, April 16 in Dornbirn, of Thomas Ferdinand Wehinger and Anna Maria Rein. Agathe has an illegitimate daugther, Anna Maria, born 1872, February 16. Do you know any about her?
P.S. If you are interested in getting further information about Dornbirn look at: www.dornbirn.at