If it were me?

[mechagucha]

Years after the death of her twin she was still treated as a pair, from the name by which she was adressed (A tripping "Agn-Anastasia," often, but more often, "Agnestasia.") to the birthday greetings from forgetful relatives. It almost didn't matter that she survived, rather than the other, because reflective surfaces were ubiquitous in the city.

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[mechagucha]

Years after the death of her twin she was still treated as a pair, from the name by which she was adressed (A tripping "Agn-Anastasia," often, but more often "Agnestasia.") to the birthday greetings from dotty elder relatives. It almost didn't matter that she'd survived without the other, as reflective surfaces were ubiquitous in the city; even alone she walked step for step alongside the specter, speech an incessant hiss, insistant. She relaxed only in her glassless study, where a fine layer of dust had settled over everything, distorting the dead face stretched across the peaks and hanging in the hollows of her bones. Anastasia: half a person held responsible for two.