Identified only as Miss Musgrave in the Silvy daybooks, this is almost certainly Miss Agnes Musgrave, 2nd daughter of Sir George Musgrave, 10th Baronet of Edenhall. On 19 June 1862, two months after this portrait was taken, she married her first cousin, Rev. Malise Reginald Graham.

According to a monumental inscription in the parish church of Arthuret in Cumberland, Agnes Graham was born on 3 August 1836 and died on 12 March 1901.