This is definitely "Scar Transformation"
She must've overcome her obsession with her dead superhero sister inside of her mental space when she opened that door (which also explains why she even became a hero in the first place, but we could've already guessed that)
Idk why her overcoming that would manifest as her looking even more like her sister, but... I'm assuming one of the next few chapters will show what was skipped after she opened that door in her mind.
Actually, I think I just realized what happened.
Rather than overcoming her desire to live up to her sister's legacy, she probably overcame the
embarrassment of trying to live up to her sister's legacy.
That would explain why she ends up looking more like her sister, and it makes more sense that her
embarrassment is the part that she overcame (leading to her "scar transformation" form looking more like her sister, now unashamed of trying to stand in her sister's footsteps), since the fear of other people's eyes (aka embarrassment) was the fear that Qbara was using to control her, which dissipated when she came out of her mental space, making it the core "scar" that the "scar transformation" used.
She's called Shy, after all.