There are many Ladies Paget, but my best guess is this is Walburga Paget who has this article in thepeerage, "Countess Walburga Ehrengarde Helena de Hohenthal F, #33907, d. 11 October 1929
Countess Walburga Ehrengarde Helena de Hohenthal married Rt. Hon. Sir Augustus Berkeley Paget, son of Rt. Hon. Sir Arthur Paget and Lady Augusta Fane, on 20 October 1860.1 She died on 11 October 1929.
She was the daughter of Count Charles Frederic Antony de Hohenthal. Her married name became Paget. She held the office of Dame d'Honneur to the Princess Royal Frederick William of Prussia.
Children of Countess Walburga Ehrengarde Helena de Hohenthal and Rt. Hon. Sir Augustus Berkeley Paget
Lt.-Col. Victor Frederick William Augustus Paget b. 14 Aug 1861, d. 28 Jun 1927
Alberta Victoria Sarah Caroline Paget+ b. 7 Aug 1863, d. 22 Aug 1944
Rt. Hon. Sir Ralph Spencer Paget b. 26 Nov 1864, d. 11 May 1940."
She was a Lady-in-Waiting to Princess Royal Victoria while she was Crown Princess of Prussia and a writer. Her Wikipedia article is here.
From Sacheverelle's photostream on flickr; sepia tone removed by gogm.