Is Ann the person listed as Ann Costollo (Widow) in the familysearch transcription of the 1881 census, at 2 Back Duke St? If so, the following from
www.cheshirebmd.org.uk could be a birth record for her daughter Sarah age recorded as 23 in 1881:
Birth Indexes
COSTELLO Sarah QUINN 1857 Stockport First Stockport Cheshire ST1/39/40 N/A
Others with mother's maiden name Quinn are Thomas born 1854 and Lucy, born 1859.
Also this could be James' death. Do you have his death date?
Cheshire Death indexes for the years: 1865
COSTELLO James 37 Stockport First Stockport ST1/46/78