What makes you think she was hurt?.
She was a negative creation from the start, intended to be evil and only think in evil.
Now Vesper in The Folly Of Celestia was both a sad, troubled and hostile, hateful individual and I'm not sure if that is who you are think of as Mean Twilight.
I'm not sure if Mean Twilight was created by drawing power from Twilight's darkside since her hair was used.