Civil Registration Indexes (Births)
Probably:

Dorothy Mary Hurworth, reg. 4th quarter of 1898, Dorchester, Dorset, England.
Dorothy May Hurworth, reg. 4th quarter of 1901, Shoreditch, London, England.
Dorothy Hurworth, reg. 4th quarter of 1905, Auckland, Durham, England.

Birth and Baptisms, London and Dorset
Probably:

Dorothy Mary Hurworth, bapt. 11 September 1898, St. Nicholas', Sydling, Dorset, England. Parents: William and Harriet Ellen Hurworth.
Dorothy May Hurworth, bapt. 03 November 1901, St. John's, Hoxton, Hackney, England. Parents: George Barnett Hurworth and Sarah Hurworth.