Question: What organization did the woman, who Märta Ulfsdotter was the head lady in waiting of, found?

Context paragraphs:
Märta Ulfsdotter: Margareta "Märta" Ulfsdotter, in Norway known as "Merete Ulvsdatter" (1319-1371), was a Swedish noble and lady in waiting.  She was the daughter of Saint Bridget of Sweden and the head lady in waiting of Margaret I, Queen of Denmark.

Märta Helena Reenstierna: Märta Helena Reenstierna (16 September 1753 – 12 January 1841), also von Schnell, known as "Årstafrun" (The Årsta lady), was a Swedish diary writer.  Her diaries were written in the period 1793–1839, and are kept at the archives of Nordiska museet in Stockholm.  They were published in 1946–1953 as "Årstadagboken" (The Årsta Diary).  They are considered as a valuable cultural historical document of the everyday life of the people at a Swedish manor of her epoch.

Darya Petrovna Saltykova: Countess Darya Petrovna Saltykova, née Countess Chernysheva (20 September 1739 – December 23, 1802), was a Russian lady in waiting, socialite and noble and Dame of the Order of St. Catherine's first degree.  She was the sister of the lady in waiting Princess Nataliya Petrovna Chernysheva, and in 1769 married to Field Marshal Count Ivan Petrovich Saltykov.

Beachy Head Lady: The Beachy Head Lady is an ancient skeleton discovered in Beachy Head, East Sussex, England.  The Beachy Head Lady lived during the Roman period, around 200 to 250 AD, and is thought to have originated from Sub-Saharan Africa.

Aurore von Haxthausen: Aurore von Haxthausen ("Gustava Charlotta Märta Aurora": 1830 in Daretorp in Västergötland – 7 February 1888 in Stockholm), known also by her artist pseudonym as Klara Kuhlman, was a Swedish author, composer, pianist and lady in waiting.

Margaret I of Denmark: Margaret I (Danish: "Margrete Valdemarsdatter" , Norwegian: "Margrete Valdemarsdatter" , Swedish: "Margareta Valdemarsdotter" , Icelandic: "Margrét Valdimarsdóttir" ; 1353 – 28 October 1412), was queen consort of Norway 1363-1380 and Sweden 1363-1364, and later ruler in her own right of Denmark, Norway and Sweden, from which later period there are ambiguities regarding her specific titles.  She was the founder of the Kalmar Union, which spanned Scandinavia for over a century.  Margaret was known as a wise, energetic and capable leader, earning the nickname "Semiramis of the North", or "the Lady King".  Though the latter was a derisive nickname invented by her rival Albert of Mecklenburg, it became widely used in recognition of her capabilities.

Busboy: In North America, a busboy, busgirl, busser or bus person is a person who works in the restaurant and catering industry clearing tables, taking dirty dishes to the dishwasher, setting tables, and otherwise assisting the waiting staff.  Speakers of British English may be unfamiliar with the terms, which are translated in British English as commis waiter, commis boy, or waiter's assistant.  The term for a busser in the classic brigade de cuisine system is commis de débarrasseur, or simply débarrasseur.  Bussers are typically placed beneath the waiting staff in organization charts, and are sometimes an apprentice or trainee to waiting staff positions.

Cypripedium arietinum: Cypripedium arietinum, the ram's head lady's slipper, is a rare orchid that grows in lightly shaded areas with calcareous soils.  It is characteristic of the alvars around the Great Lakes in North America, as well as in New England.  In Canada, it is found from Quebec to Saskatchewan, plus an isolated population in Nova Scotia, where it grows on gypsum based soils, 330 km away from the nearest population in Maine.

Maria Aurora Uggla: Maria Aurora Uggla, married name Ehrengranat (1747–1826), was a Swedish lady in waiting and noble.  She was the lady in waiting and confidant of the Swedish Queen, Sophia Magdalena of Denmark, and later the head of the court of Crown Prince Gustav Adolf.

Olga Tomilova: Olga Tomilova (1822-1894), was a Russian pedagogue.  She was the principal of the Smolny Institute in Saint Petersburg in 1875–1886.  She graduated from the Smolny Institute with the highest honors in 1839 and was a lady in waiting prior to her marriage to the estate owner Roman Tomilov (1812-1864).  As a widow, she became a lady in waiting and in 1872 deputy principal of the institute.  She was an innovator who reformed the institute with ideas she had observed in Western Europe, were formal education was at this time made available for women.  Among her innovation was training in practical craftsmanship.

Supporting paragraphs: Märta Ulfsdotter Margaret I of Denmark
Answer: Kalmar Union