I do not have "Anna Robl" in my Family tree, but I do have Johann Robl, born 1795 (I haven't found the village yet). The Robl were a quite big family in Bohemia (and approx. a fourth of them had the names "Johann" and "Anna" :). Do you have any more information for me, that I could cross-check with my Robl family? I also have a lot of "Stadlers" that immigrated to Baltimore. Do you know anything about them?
And there is a connection between "Stadler" and Robl: Alexander Stadler married Katharia Robl, who was a daughter of Eva Robl, who was a daughter of Johann Robl. Maybe Anna was a sister of Katharina?
Wouldn't be the first time in my family history that a whole bunch of sister, brothers, husbands and wives emigrated.