Thanks very much Brian and Frances.
Sofar info as follows:
Sarah Tate, c.8 Apr 1827 Douglas St.Matthews,parents William Tate and Ann Sayle.
Sarah Tate m.Edward Cowley 18 Sep 1851 Bradden.
I agree that there is no Edward with any Sarah Cowley in 1881. I have found a George Edward Cowley c. 27 May 1852 St.Barnabas, Douglas.
Perhaps an 1861 Census would provide a follow-up? And also search for a Sarah Cowley 2nd marriage in subsequent years?
Thanks again.