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Prompt was Draw a pony reaching the breaking point / Draw a pony at the end of their rope.
In my headcanon, she lost that wing trying to assassinate Sombra at supersonic speed, so he couldn’t hear her coming. Unfortunately, he saw her and put a sharp pillar between himself and her in the nick of time. She now blames herself for every death in the war since her failed attempt, and she just got news that another Wonderbolt wasn’t as lucky as she.