Of course Wikipedia is not the most reliable source. I'm pretty sure that second line stopped after Duchess of Saxony. The rest of those titles were only held by the reigning Dukes (and their wives). Family members were simply Prince/ss of Saxe-whatever, Duke/Duchess of Saxony.
A question like this and many others could easily be answered with a simple Google search, Forrest: https://en.wikipedia.org/wiki/List_of_titles_and_honours_of_Mary_of_Teck
* Princess of the United Kingdom: 1893-1910
* Princess of Saxe-Coburg & Gotha; Duchess in Saxony; Duchess of Juliers, of Cleves, of Berg, of Angria, and of Westphalia; Landgravine in Thuringia; Margravine of Meissen; Princely Countess of Henneberg; Countess of the Mark and of Ravensberg; Lady of Ravenstein and of Tonna: 1893 then disused after 1917.
* Duchess of York, Countess of Inverness, Baroness Killarney: 1893-1910
* Duchess of Cornwall and Rothesay, Princess of Scotland, Countess of Chester and Carrick, Baroness of Renfrew, Lady of the Isles, then also Princess of Wales: 1901-1910
* Queen of the United Kingdom: Consort 1910-1936, dowager 1936-1953 (queen mother 1936-1952, queen grandmother 1952-1953)
* Empress of India: Consort 1910-1936, dowager 1936-1953.
May of Teck, a princess of a German & the English royal family, somewhat impoverished, a cousin to Queen Victoria seems, to me, to have led a remarkable life. Being minor type royal, she became betrothed to the heir of the British throne, yet married his younger brother. When her husband ascended the throne as George V, she became Queen. Besides being the consort to the king, she would serve two stints as Queen Mother. What other royal and imperial titles were bestowed upon this woman during her long life?