She and her sister Agneta Strömfelt belonged to the first circle of courtiers appointed to Louisa Ulrika after her arrival in Sweden together with Cathérine Charlotte De la Gardie, Henrika Juliana von Liewen and Charlotta Sparre.

[1] In 1756, Queen Louisa Ulrika planned a coup d'état to depose the parliamentary system of the Age of Liberty with a restoration of an absolute monarchy.

A different source claims that it Ulrika Strömfelt informed the foreign office of the Riksdag of the secret correspondence between the Queen and her brother, Frederick the Great.

In 1777, she returned to court and succeeded Anna Maria Hjärne as Överhovmästarinna (Chief lady in waiting or Mistress of the Robes) to the new Queen, Sophia Magdalena of Denmark with Charlotta Sparre as her deputy, a post she retained until her death.

Ulrika Strömfelt has been said to have a "peculiar position" in the diaries and memoirs of the time, because there are no negative remarks about her personality and character, and she is unanimously described as respectable, sensible and as an ideal of contemporary femininity.