Scan courtesy of Bleeding Cool:
The lasso helps people for who they truly are. That's why when Diana threw the lasso around Donna after the male Amazons' massacre, Donna had that look of shock on her face. She realized that everything she was made to believe by Hecate and the old crone was a lie.
I think it's possible for Donna to be every bit the hero she was Pre-New 52 in light of this.