Hunting relatives

Bergen 956 1913 Mai 7 Henrikke Franciska Johnsen f ug Ekspeditrice 1890 23 Bergen Bergen Amk Spokane Wash Nei a (bedre livsvilkaar) Husarb Reiser til bekjendte Canadian Pacific. This what I have found in Digitalarkivet. Henrikke was my grandfather's sister. My mother who passed away in 2001 talked about her as "tante Rikke". How can I go about trying to trace decendent of Henrikke. Ellen