Is she on the 1911 census with her parents? If not - then have you checked freebmd deaths from 1904-1911
USING THE FREE 1911 INDEX TO DETERMINE THE CORRECT HOUSEHOLD
http://www.1911census.co.uk/search/tnaform.aspxOnce you find a possible match - make a note of the county and district in which the person was living
Return to the index and in PERSONAL DETAILS - just put the surname of the family - nothing else
In LOCATION - Select the county and below it - type in the district
In OTHER MEMBERS OF THE HOUSEHOLD - show the full name of the person you have found on the index
Click SEARCH
The 1911 census is strictly pay per view so you will have to buy credits to view the full entry - the above instructions will only help to possibly show others of the same surname in the same household