Hi Eleanor Rose
Was it Winifred born 1904? If so, have you found her on the 1911 census
http://www.1911census.co.uk/ If not, using the advanced person search in the free index shows a "Winfred MUNDAY" of about the right age in the Eastry registration district. Searching again for anybody called MUNDAY in the same household as a Winfred MUNDAY in the Eastry district shows a family including James Moses age 60, Mary age 57, Russell George age 18, Lily age 20 etc.. You will need to purchase credits to view the actual census to see all the details ie. birthplaces/relationships but they do look to be this family who also had a daughter named Bessie:
1891 23 Stewart Road, Tonbridge, Kent
James Moses MUNDAY head mar 38 general dealer b.Biddenden Kent
Mary wife 36 b.Biddenden
Isabell dau 15 b.Biddenden
Mary dau 14 b.Cranbrook
James M son 11 b.Challock
July dau 9 b.Chilham
Bessie dau 7 b.Biddenden
Rosa dau 5 b.Biddenden
Lucy dau 3 b.Maidstone
Lily dau 1 b.Tunbridge Wells
RG12/680 folio 126 page 14
....................
Bessie Munday bap Biddenden 23 Mar 1884 dau of James Moses MUNDAY and Mary
http://www.familysearch.org1901 11 Wellington Road?, St Matthew Silverhill, Hollington, Hastings, Sussex
James MUNDAY head mar 49 builder's lab b.Biddenden Kent
Mary wife 46 b.Biddenden
James son 20 wood dealer b.Challock
Bessie dau 17 general servant b.Biddenden
Rosie dau 14 b.Biddenden
Louie dau 12 b.Maidstone
George son 9 b.St Leonards Sussex
Esther CROUCHER niece 17 parlour maid b.Headcorn Kent
RG13/872 folio 35 page 32
Casalguidi