On reflection, this is more likely to be Ann’s death:

Name: Ann Brew
Gender: Female
Burial Date:
Burial Place:
Death Date: 25 Jul 1880
Death Place: Douglas, Isle Of Man, England
Age: 76
Birth Date: 1804
Birthplace:
Occupation:
Race:
Marital Status: Widowed
Spouse's Name: Robert Brew
Father's Name:
Father's Birthplace:
Mother's Name:
Mother's Birthplace:
Indexing Project (Batch) Number: B01535-7
System Origin: Isle of Man-EASy
GS Film number: 454968
Reference ID: V1 1849-1900 p 132

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In 1871 she was probably the 73 yr old widow living with married daughter Jane McVey (married Michael McVey 18 Aug 1866 Braddan) at 16 South Quay, Douglas.