Can't see them in 1891 but they are in Kent in 1871.
RG10; Piece: 1017; Folio: 61; Page: 9
District Camp 3rd Foot, Cheriton, Kent
William WOODRUFFE, Soldier mar 37, Corporal 2/3 Foot, born Glossop, Derby
Mary WOODRUFFE, wife mar 26, Laundress, born Ireland
John WOODRUFFE, son 7, Scholar, born Gibraltar
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Ravina WOODRUFFE, dau 3, Scholar, born Ireland
Frederick WOODRUFFE, son 1, born Aldershot, Hampshire
She is listed as a Scholar in 1881, so it was probably a Catholic boarding school.
Ian C