Question: Princess Victoria Louise of Prussia was the great-granddaughter of a Queen of Great Britian and Ireland that adopted what additional title in 1876?

Context paragraphs:
SMS Victoria Louise: SMS "Victoria Louise" was the lead ship of her class of protected cruisers, built for the German Imperial Navy ("Kaiserliche Marine") in the late 1890s.  She was laid down at the AG Weser shipyard in 1895, launched in March 1897, and commissioned into the German fleet in February 1899.  She was named after Princess Victoria Louise, the daughter of Kaiser Wilhelm II.  The ship was armed with a battery of two 21 cm guns and eight 15 cm guns and had a top speed of 19.2 kn .

Princess Victoria Louise of Prussia: Victoria Louise of Prussia (Viktoria Luise Adelheid Mathilde Charlotte; 13 September 1892 – 11 December 1980) was the only daughter and the last child of German Emperor Wilhelm II and Augusta Victoria of Schleswig-Holstein.  She was a great-granddaughter of Queen Victoria through her father.  Her 1913 marriage to Prince Ernest Augustus of Hanover was the largest gathering of reigning monarchs in Germany since German unification in 1871, and one of the last great social events of European royalty before the First World War began fourteen months later.

Prince Welf Henry of Hanover: Prince Welf Henry of Hanover ("Welf Heinrich Ernst August Georg Christian Berthold Friedrich Wilhelm Louis Ferdinand Prinz von Hannover"; 11 March 1923 – 12 July 1997) was the fourth son of Ernest Augustus, Duke of Brunswick and his wife Princess Victoria Louise of Prussia, the only daughter of Wilhelm II, German Emperor and Augusta Viktoria of Schleswig-Holstein.  The prince was known to his family as "Welfi."

Princess Barbara of Prussia: Princess Barbara of Prussia (German: "Prinzessin Barbara von Preußen" ; 2 August 192031 May 1994) was the only daughter and elder child of Prince Sigismund of Prussia and Princess Charlotte of Saxe-Altenburg.  She was a great-granddaughter of Frederick III, German Emperor and a great-great-granddaughter of Queen Victoria.  On 17 September 1952 she was legally adopted by her paternal grandmother, Princess Irene of Prussia ("née" Princess Irene of Hesse and by Rhine), a granddaughter of Queen Victoria.

Princess Helena Victoria of Schleswig-Holstein: Princess Victoria Louise Sophia Augusta Amelia Helena of Schleswig-Holstein (3 May 1870 – 13 March 1948), known as Princess Helena Victoria, was a granddaughter of Queen Victoria of the United Kingdom.

Queen Victoria: Victoria (Alexandrina Victoria; 24 May 1819 – 22 January 1901) was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death.  From 1 May 1876, she adopted the additional title of Empress of India.

Prince George William of Hanover (1915–2006): Prince George William of Hanover ("Georg Wilhelm Ernst August Friedrich Axel Prinz von Hannover"; 25 March 1915 – 8 January 2006) was the second eldest son of Ernest Augustus III, Duke of Brunswick and his wife Princess Victoria Louise of Prussia, the only daughter of Wilhelm II, German Emperor and Augusta Viktoria of Schleswig-Holstein.

Bertrand Stewart: Bertrand Stewart (December 1872 – 18 September 1914) worked as a solicitor in London and was also a military officer in the Queen's Own West Kent Yeomanry, he fought in the Second Boer War and World War I.  In between the two wars he volunteered to spy on German naval actions.  He was famously arrested in Germany on 2 August 1911 and sentenced to four years in prison.  Stewart and another British spy, Captain Trench, were pardoned and released by the German Kaiser as a present to Ernest Augustus the Duke of Brunswick when Augustus married the Kaiser's daughter, Princess Victoria Louise of Prussia.  He died fighting off a German attack near the River Vesle during the Battle of the Marne.

Prince Christian Oscar of Hanover: Prince Christian Oscar of Hanover (German: "Christian Oskar Ernst August Wilhelm Viktor Georg Heinrich Prinz von Hannover" ; 1 September 1919 – 10 December 1981) was the fourth child of Ernest Augustus, Duke of Brunswick and his wife Princess Victoria Louise of Prussia, the only daughter of Wilhelm II, German Emperor and Augusta Viktoria of Schleswig-Holstein.

Royal Irish Fusiliers: The Royal Irish Fusiliers (Princess Victoria's) was an Irish line infantry regiment of the British Army, formed by the amalgamation of the 87th (Prince of Wales's Irish) Regiment of Foot and the 89th (Princess Victoria's) Regiment of Foot in 1881.  The regiment's first title in 1881 was Princess Victoria's (Royal Irish Fusiliers), changed in 1920 to the Royal Irish Fusiliers (Princess Victoria's).  Between the time of its formation and Irish independence, it was one of eight Irish regiments.

Supporting paragraphs: Princess Victoria Louise of Prussia Queen Victoria
Answer: Empress of India