She was friends with composer Adela Maddison who, in 1893, dedicated her "Deux Melodies" to her.[2][4] She was also friends with composer Ethel Smyth.[3]
On 22 August 1907, at Bad Homburg, a spa in Germany, Mabel Batten met Radclyffe Hall. Batten was 51 years old and Hall was 27. In 1913 Batten and Hall visited the Lowthers at Claude's Herstmonceux Castle.[3] When Batten was a widow, she went to live with Hall in Cadogan Square.[1] Batten, nicknamed Ladye, gave the name John to Hall, which Hall used for the rest of her life.[5]
In 1915 Hall met Batten's cousin Una Troubridge (1887–1963). When Batten died the following year, Troubridge took care of a defeated Hall and in 1917 they went to live together.[6]
Batten is buried in a vault in the Circle of Lebanon on the western side of Highgate Cemetery in London, and Hall chose to be buried at the entrance of the crypt.[2]