Possibly Helen M BULKLEY of St Agnes, Cornwall who is known to have exhibited from 1909-1929 (J&G).
The only local records for this artist are in the NAG Exhibition Record for December of 1925, and the Craft section of the NAG show of December 1926, but the entries are unspecified.
Painter and craftworker
L (7); LS (12)
NAG Dec 1925, Dec 1926 (Craft section)
Cornishman 8 Dec 1926
Hardie (2009) Artists in Newlyn and West Cornwall
Johnson & Greutzner (1975) Dictionary of British Artists
NAG Exhibition records