Luckenbach family, Ostpreussen

I am writing as a new lister, inquiring about the Luckenbach family. My gr.
grandmother, Auguste Luckenbach, was born in Elk (Lyck) in 1858, emigrated to
Illinois in 1880 via the ship Gellert. She came as a single woman, but
married William Bensenberg in Moline, Illinois. Her family was Lutheran. Members of
her family (?) migrated in 1882, according to "Germans to America," father
Friedrich, mother Eva, brother Fr.(iedrich?), sister Emilie. Mother appears in
1900 census living with Auguste and William. The record says they were from
Schleswig-Holstein, and sister Emilie married William's brother, Henry Peter
Bensenberg, also in the U.S. I am looking for more info about the family prior
to migration. Thanks for your help.

Marcia Whitcomb, Denver