Death does not necessarily result in burial in consecrated ground or cemetery so there may be no record.

Do you have the correct line ?

1851, Patrick, district 1, schedule 26, Eary Cushlin
Charles Cowin, head, married, 45, farmer of 28 acres employing 1 labourer, German
Catherine, wife, married, 32, Ballaugh
Joseph, son, unmarried, 3, German
Anne, daughter, unmarried, 1, German

The only "unattached" Catherine aged around 6 is one born in Ramsey staying with grandparents Thomas & Catherine Cannell in Michael.

There is no other Charles in 1851.