Not in the 1881 census. Birth regd in 2nd quarter 1881. The 1881 census was taken 5th April so she may not have been born then. Died in 1890 aged 9 so not in 1891 census.
[S538] RG Index of Births, Recno:1430 (Reliability: 2).
[Recno:1430 Yr: 1881 Qtr:2 Dist:wigan Ref:8c/93 ]
mary hidden wigan Mothers Maiden Name: Jones
[S1385] BMD on-line, Ancestry etc, Recno:13572.
[Recno:13572 Yr: 1890 Qtr:2 Dist:Wigan ]
Name: Mary Hidden
Estimated Birth Year: abt 1881
Year of Registration: 1890
Quarter of Registration: Apr-May-Jun
Age at Death: 9
District: Wigan
County: Greater Manchester, Lancashire
Volume: 8c
Page: 51 (click to see others on page)
[S536] Certificate of Marriage, Recno:265 (Reliability: 3).
[Recno:265 Date: 17 Feb 1873 Dist:wigan SubDist:st georges wigan ]
john hidden minor bchlr collier son of john hidden, farmer and mary ellen belshaw full spr born out of wedlock, gs bm Wit: william winstanley margaret(X)prescott CE banns
[S539] RG Index of Marriages, Recno:2222 (Reliability: 3).
[Recno:2222 Yr: 1873 Qtr:1 Dist:wigan Ref:8c/89 ]
john hidden wigan [& mary ellen belshaw]