Insight 2 is defined in the game as the depths of their enlightenment towards their own Arcanum.
Important Note : Insight 2 is kept once reached, however like in the game, the outfits can be unequipped at any time.
Sonetto doesn’t have a labeled Insight 2 outfit however you can get a second outfit for her that functions as it from completing the beginning player missions. The outfit shows her leading a parade in the Foundation with the description of “A new sky, an exotic journey, a perfect show, the beginning of a breathtaking story.”
Assuming this is her Insight 2 outfit, it’s still unclear when she gained Insight. We can assume that the outfit was gained before 1.1
Druvis shows Insight 2 in (4.6), in (4.4) she is Insight 1. In her Insight 2 art, the tree we see her on in 1.8 is alive and flourishing again when it was dead in (1.8). She possibly reached Insight 2 during (2.6) or (2.11) when she left Manus Vindictae and decided to live moving forward again. A good reason for her to become enlightened and supported by her Inspiration of “Thirst of the Woods [Plant]” following Vertin showing her the Rowan branch she kept on her all this time was reviving itself in symbolism that she too needed to start healing from within.
During the First New Year's art (2024), Regulus is seen with her Insight 2 outfit. X, Vertin, Sonetto, and APPle are shown at Insight 1. The new years art is them in London at an unknown time
Important note : APPle is shown at Insight 1 in Regulus’ Insight 2 art implying that he gained Insight 2 after her. However in the Chinese New Year’s art (2024) , everyone is insight 1 including Regulus.
This means that either she gained Insight 2 before the first the New Years / Holiday within the Foundation, or the official art cannot be taken as canon representation. However, The Foundation celebrates holidays as The Fool implied in the end of [Master of Theatrics] that The People’s Troupe put on a play every Christmas.