From 1887 to 1891, she supported Kerner von Marilaun in his work “Schedae ad floram exsiccatam Austro-Hungaricam” for which she provided more than 1,200 documents.
Another area of interest for Eysn was history, for example she was involved in the research of the archaeologist Matthäus Much on Lake Mondsee in Upper Austria.
She conducted extensive ethnological studies and published her main work “Folklore from the Bavarian-Austrian Alpine Region” in 1910, which formed the basis for her recognition as the "founder of pilgrimage research."
Rupprecht, Crown Prince of Bavaria provided her with an apartment in the Villa Brandholzlehen in Berchtesgaden, Germany where she spent her retirement.
[5] In collaboration with her pupil and successor, the folklorist Rudolf Kriss, the basis for a religious folklore collection was created during this period, which later went to the Bavarian National Museum.