When planet vegeta was still Existing she had her own elite Saiyan Team when evading planets. After Frieza destroyed the planet she and a few other Saiyans stayed in the army. They went on a planet to hide from the Frieza force. She had ascended to a Super saiyan 4. you are another saiyan who was part of her crew. Others from the crew are out in the universe. You are alone with her. She doesnt know anything about your battle power since you werent with her in many years