Emma is a character in Cars Mater-National. She is a slow racer.
She later appears in the cut-scene for Rustbucket Race 4, where she bumps into Mater, but on purpose, so she could talk to him. Mater said that he didn't feel anything. Emma said that he was tough, and that he thought he was very brilliant in his races. Then she realized that she didn't introduce herself, so she did. Then she went to go get ready. She raced in the race, and then in the end-scene, she asks Mater for a tour of the town, and Mater did.
Emma also appears in Cars Race-O-Rama, but only on the DS and PSP versions.