Mrs Margaret Mary Dilke was married to Ashton Dilke MP (1850-1883), only brother of Sir Charles Dilke (1843-1911), and whose son, Sir Fisher Wentworth Dilke became 4th Baronet on the death of his uncle Sir Charles Dilke.
Sorry she is unable to accept Miss Becker's invitation for the 17th as she will be out of town and may not even be able to attend the Annual Meeting. No date but probably about 1884 after the death of Dilke's husband.