There is a voyage.
Arrived: New York 22 Sep 1879.
Genevive Niven Aged 35 American
It seems that her husband was in the army...
Knox Rowan Niven
Lt Colonel 24 Mar 1877
1st West India Regiment
Also, this is the probate for their daughter.
"Florence Rowena Knox Niven of F1 Queen Alexandra Court, Wimbledon Surrey Spinster died 12 May 1947 at 34 Woodside Wimbledon. Administration London 29 Aug to Norah Caroline Laing widow £114. 1s. 1d."
Norah, their other daughter, obviously married someone named Laing.
I think Juliet had married Knox Rowan Niven in Jan 1885 at Northumberland. Haven't found Juliet's parents so far.