Her father died when she was a child, and Aeta, her two siblings and her mother Adelaide, daughter of General Henry Nicoll, CB returned to live in Britain.

[1] In October 1906 Lamb took part in a deputation to the House of Commons and was arrested, but ultimately released after her mother paid her fine.

In 1911, Lamb was one of the last WSPU members to go there, planting a commemorative tree in their arboretum which they had named the 'Suffragette's Rest', before the Blathwayts withdrew their support due to the growing militancy of the organisation.

[2] After these campaigns, her health and stamina began to fail, so she returned to London to work at the WSPU headquarters at Clement's Inn until the outbreak of the World War I, becoming one of its longest serving organisers.

[1] Lamb remained loyal to the WSPU throughout its campaign, despite developing increasing misgivings of its policies of violent protest over the course of her time with them.