From the link:
Before story, balance exists. The world rests at peace. Something or someone interjects itself upon this serene scene, instantly creating an inequity. Sensing this new imbalance, our minds label the differential a problem and naturally begin the process of resolving that problem.
According to this, the imbalance for the MC is her family's arrest. We all care about that. But nobody else in the story gives a hoot about it. If they knew it, they'd be glad it happened because it follows along what they want to keep things balanced.
In the Star Wars example, it would be perhaps
the imposing Empire overextends itself by boarding a diplomatic ship.
With the MC's peaceful life being taken over by the "Empire."
In Star Wars, it's not the purchase/ loss of R2 that is the loss of balance, though for Luke it was.
the Goal of the Story is story-wide, it is not tied to the personal issues of any one character. It is objective and universal.
In which case, the goal seems to be get rid of the Misfits.
For example, another of the links
The Empire’s aggression in those opening scenes has a meaningful connection to what is going on inside of Luke personally.
Yes. Ultimately, her family's arrest enables the real trilogy inequity to be equalized, bringing a new peace to society. Like with Luke. Moving back, the inequity occurring before the OS story began was the claim that "the misfits caused" the great war, and this state of dissatisfaction will be satisfied when they're done away with.
I'm very open to respin this, but it's man against society, so it seems that the MC is antagonist. Or I suppose it could be an underdog story where EVERYONE is antagonist. The fact that she's pretending to be someone else makes me think she's really the antagonist in THEIR story.