re: Catherine Duff of Ireland

[PrincessMinnieHaHa]

I found a Catherine Duff arriving in Philadelphia, Pennsylvania on 28 Apr 1914.  She was 20 years old, Irish, and her port of departure was Queenstown, Ireland.  Her friend listed (in America) is one Lawrence Duff.  Her birthplace was listed as Mountoak, Ireland.
If this is your Catherine Duff, the passenger list is available online.  
I hope this helps.  Good luck!