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Yeah you’re right. Don’t you think the “argument” is a reasonable analysis? Inertia Symmetry does get broken because she returns in a different inertia frame due to her acceleration (observer is a she btw).
Yes, that's sufficient to say that the principle of relativity is is no longer applicable when one observer is accelerating, and hence the symmetry is broken.. But to say that the result that she returns younger still requires working out the details
