Hi Jan, this is a juicy one! There are no families called Shelly or Shelley in Kerry around 1850 according to Griffith's Valuation. There are only 6 returns for that name, all in Co. Laois (Queen's Co.) John, Jeremiah and William.
http://www.askaboutireland.ie/griffith-valuation/index.xml?action=doNameSearch&Submit.x=20&Submit.y=7&Submit=Submit&familyname=Shelley&firstname=First+Name&baronyname=&countyname=&unionname=&parishname=
I am guessing that Shelley is Johanna's marriage name.
The Church records I sent you list Matthew, Joseph, Edmund, Catherine and Mary with the surname Shelley. Relations of Edward's possibly? (Since the surname pool in Kerry is so small)
I have sometimes seen Edward used interchangeably in Kerry records with Edmund.
The 1901 Census gives no returns for Shelley in Kerry and only 111 in the whole of Ireland.
Thinking about it, probably your best bet is to look for every single record you can find in Nova Scotia
Census Records
Passenger Lists
Land records
Newspaper Announcements/Articles
Wills
Headsones/Cemetary Records..... findagrave.com has 164 returns for Shelley, Canada
Church Records
Close Neighbours who may have travelled from the same place in Ireland
Military Records
Death Certificates which sometimes give a lot of information about a person. I recently found the birth surname of a woman called Mary in her daughter's death certificate. As far as I know it was not recorded in any other existing record.
since one of them may contain further information. My own great uncle Luke Brennan gave his complete address when questioned at Ellis Island about his place of origin! From a quick look at Canadian records for Shelley, you may be slightly hampered in that a number of Shelley families came directly from homes in England to Canada, but again the surname pool is small in comparision to many other Irish names.
Do let me know how you get on....and certainly if you can find Johanna's birth surname we may be able to make a bigger Irish Search. What interests me is that I have not found any Kerry baptism with a child with the surname Shelley.
Warm wishes
Martine
PS do you know where Edward was from in Ireland?