Grace is a member of Abnegation who is briefly mentioned in Allegiant.
Allegiant[]
When Tobias Eaton and Peter Hayes go to the Factionless' Headquarters (Old Erudite Headquarters) they are confronted by guns at the door. Grace, who is among them, recognizes Tobias as they used to be neighbors in Abnegation. She hesitates to let them see Evelyn Johnson-Eaton but after asking someone she lets them in.
Early life[]
Grace was Tobias's neighbor when he lived in Abnegation. She was described by Tobias as a nice person and he was surprised when he saw her with a gun as a Factionless.