Jemima Blackwood's article in thepeerage is here. She was married to Edward Henry Stuart Bligh, 7th Earl of Darnley, who "died on 31 October 1900 at age 49, without male issue." She then married Admiral Sir Arthur Cavenagh Leveson. She had a daughter from her first marriage, a son by her second marriage.
From www.liveinternet.ru-users-arin_levindor-post113079788; glass cracks and spots in left image removed with Photoshop by gogm. The image posted to this site is 11-inches (28 cm) high.