Hi,
Not sure if it helps but Della or Delia Rossiter is the daughter of Patrick Rossiter & Ellen Hennessey.
Also found a death record for Delia Fraher on 15th May 1949 at Holy Sepulchre Cemetery, East Orange, Essex County, New Jersey, U S A.
Her husband Daniel was born in New Jersey so it's seems possible that they may have ended up there.
Hope this helps.
Best wishes, rcuser