Hello Amanda

Could not find a marriage or children on the Isle of Man.
So looked at NZ BMD's and found a marriage in 1910 Eleanor A Clague to William Charles Ernest Dennis. Could only find one child to 22/09/1919 (100 years only available) - 1915 Leslie CORLETT Dennis - so this must be your Eleanor
Could not find Eleanor on 1901 census IOM - Brian Lawson's Indexed census. Did find one Eleanor A in Douglas, but she was with her SIX sisters , so could not be her.
Looked on the NZ immigration part of LDS IGI , but very few first names there are stacks of E Clague/Clegg arriving prior to 1910 , almost all males, but could not find her.
There were a lot of people in that period who immigrated to Australia and found it too hot and moved onto New Zealand.

David Dwyer