Lesley, it would help to know more about who the MI is for.
I think I found a connection for grave #3119

No MI for Alice
Per Burial Record she was from Rushen and was buried in grave #3119

Braddan New Burial Ground
Section One blk 5
#3119 In memory of ROBERT ANDREW COWLEY Joiner of Douglas who died at Manchester December 13th 1866 aged 22 years
also CATHERINE wife of the above who died November 7 1877 aged 47 years and was interred in Malew Churchyard
also ANN CORTEEN aunt of the above who died May 15 1909 aged 80 years
also EMILY JANE daughter of the above ROBERT ANDREW COWLEY died November 30th 1911

This Robert Andrew Cowley seems to be the one
ch Robert Andrew Cowley 25 DEC 1845 Saint Barnabas, Douglas son of William Cowley and Jane Cleator who md 02 JAN 1840 Jurby
Is this the Wm and Jane you're looking for??

This seems to be Jane
Braddan New Burial Ground Section One blk 3
#1492
MI quoted in previous note.