A heroic moment in Little Dorrit, and in all of literature

As noted in previous post, a running theme in Dickens's Little Dorrit (1855) concerns characters oblivious to their own nature and their own faults or worse, the prime example being Mr. Dorrit himself, who continues to exploit his daughter (the eponymous Little, aka Amy), who has devoted every minute of her life to caring for the needs of her father and sacrificing her own comforts and potential happiness. In regard to Mr. D., Dickens adopts an unconventional narrative strategy and never says outright that he is a tyrant and a fool; rather, the narrator keeps saying what an honorable and respected man he is, while of course meaning and conveying the precise opposite. In a parallel section of this extreme complex narrative, we see the Meagles family, introduced to us in the mysterious 2nd chapter as they along w/ the protagonist (Arthur Clennom) and others are released from quarantine and continue on a journey from Asia home to England. Here, the narrator is more opaque; Mr. Meagles continues to describe himself and his wife as "practical," and in a sense that's true, from his POV. The strange thing about the M family is that they have 2 daughters: Pet (with whom Clennom has fallen in love, though he cannot admit this even to himself) and Tatticorum (not sure of spelling), whom I think is an adopted daughter and perhaps of mixed race (again not sure, would have to re-read earlier chapter). Meagles's self-delusion is that he treats the two daughters equally and that he has provided a loving and caring home for Tatty. But we see from the outset this she is full of repressed rage - Meagle's is always telling her to "count to 25" to soothe her outbursts. At last, about about 1/3 through this (long!) novel, Tatty refuses to bow down to her ignorant and selfish father; she leaves home, and, once tracked down (to the flat of Mrs. Wade, a mysterious woman who was also in the quarantine and who seems solitary and antisocial) she lets him have it - recounting the many ways in which Pet has been favored and Tatty abused. It's a heroic and political moment in this novel - in fact, in literature - as the oppressed one revolts and punctures the facade of courtliness and generosity that covers up class abuses across English society, then and maybe now. It's also a warning shot: will Little Dorrit ever speak up to her own abusive father?