[3] On 21 April 1662 she married a royalist Sir Thomas Giffard, baronet of Castlejordan, County Meath who was a relation of Lord Halsbury.

She would not marry again and she was known for controlling her passion,[2] although she was exchanging letters with the diplomat and potential suitor Sir William Godolphin.

She understood languages and she travelled with him to diplomatic meetings in Amsterdam and The Hague leading up to the 1668 Treaty of Aix-la-Chapelle and the end of her letters to Godolphin.

[2] The treaty was underwritten by the Triple Alliance, that her brother took the credit for, ending a war and bringing England peace with its neighbours.

[2] Her biography of her brother, The life and character of Sir William Temple, Bart., was published in 1728 with the author named as "a particular friend".