If she is the Annie with George STOPPS at Shippon, Berks in 1891, her birthplace is given as Shirburn, Oxfordshire. Same as in 1881 and 1901.
There is only one Ann BROOKS born in that area on FreeBMD that I can see and that is Jun qtr 1854, Thame, 3a 499. Shirburn comes under the Thame registration district.
Possibility in 1861
Shirburn Village
Thomas BROOKS, head mar 64, Labourer, born Shirburn, Oxfordshire
Ann BROOKS, wife mar 42, Lacemaker, born Watlington, Oxfordshire
Ann BROOKS, dau 6, Scholar, born Shirburn, Oxfordshire
Lucy BOWER, boarder unm 44, Lace maker, born ditto
RG9/885/99/2
1871
Ann BROOKS, servant unm 16, Domestic servant, born Oxon, Shirborne
in household of William H DAVEY and family, the Vicar of Aston Rowant, Oxfordshire
RG10/1430/31/6
Aston Rowant is given as the place of birth for George STOPPS, which is where he was in 1871, with his parents Abraham and Mary - RG10/1430/31/5 - a couple of houses away from the Vicarage where Ann was.
Ian C
OOPS repeated a couple of things. Sorry Carole