Searching for Kellys, emigrated to PEI 1839

I am from Prince Edward Island, Canada and we are searcing for information on a family of Kellys who came from the parish of Donagh (or nearby parish, eg Drumnoland, Tednavet) in 1839. My great, great, great grandmother Mary Kelly (we think she was a widow at the time, late husband perhaps Francis?) left Donagh on a ship Agitator or Connisbruck (Consbrook) out of Belfast. The ship arrived in Charlottetown, PEI in late May 1839.

We think Mary was accompanied by at least 3 sons - Edward (d o birth ~ 1804), Arthur (d of birth ~ 1819) and John (d of birth ~ 1820).

With Edward, 32 to 34 years of age at the time, travelled his wife Ann Boylan (from Donagh or neighbouring parish) and, we think, 2 children - Bridget (d of birth 10 August 1837) and James (d of birth 1838).

We wish to learn the precise location from which our Mary Kelly and her sons came, and we would like to locate and meet any relatives who remained behind in Ireland.