She was a well known and prominent profile within the British royal court, where she took a dominant position; von Schwellenberg was a favourite and confidant of Queen Charlotte, and handled access between the Queen and various supplicants, which gave her an important influence.
[1] She is frequently mentioned in contemporary satires, songs, memoirs, diaries and other writings, such as those of her colleague Fanny Burney.
Juliane von Schwellenberg, alongside Johanna Hagedorn, was selected to accompany Charlotte from Mecklenburg-Strelitz to her wedding in Great Britain in 1761.
In the British royal household, she was given the shared office (with Hagedorn) as "keeper of the robes" with responsibility for the queen's wardrobe and dressing.
She was the intimate confidante of the queen and as such wielded immense influence within the royal court.