She married
Sheridan Hamilton-Temple-Blackwood, 5th and last Marquess of Dufferin and Ava, her fourth cousin (through their great-grandfather,
the 1st Earl of Iveagh), at
Westminster Abbey on 21 October 1964.
Princess Margaret was among the 2,000 people in attendance, and
the 9th Earl of Arran, then Viscount Sudley, was the best man. Lindy wore a dress by
John Cavanagh and the Dufferin and Ava shamrock
tiara. In his will, Lord Dufferin bequeathed
Clandeboye, the 2,000-acre family estate in
Bangor, County Down,
Northern Ireland, to his widow. Nervous about moving to Northern Ireland during
the Troubles, she became active in conservation issues as a way to bring people together. She invited an environmental group, BTCV (known as Conservation Volunteers Northern Ireland within the region), later renamed as The Conservation Volunteers, to open its first Northern Ireland branch. "I thought this was a way to bring the estate back to its historic position of being the centre of the community." The estate includes a large herd of heifers, and in 2009, Dufferin launched Clandeboye Estate Yoghurt, then the only yoghurt producer in Northern Ireland. She also opened an art gallery, the Ava Gallery, She died on 26 October 2020 at
Belfast City Hospital after a short illness, aged 79. ==References==