Her parents were Frances (born Hannay) and Scottish-born Bengal civil servant George Udny.
In 1980 she also became involved in the management of Lisson Grove elementary schools in Marylebone working with Alice Westlake.
The group included Elizabeth Lidgett and her sister Mary Bunting and it was led by Annie Leigh Browne.
[2] Mallet, Annie Leigh Browne, Eva McLaren, the Marchioness of Aberdeen[3] and Millicent Garret Fawcett were key members.
[4] Mallet was at the International Congress of Women in 1899[5] and she served on the WLGS executive committee until 1901.