Becky correctly diagnoses what’s holding Amelia back from Dobbin—her love of the dead George. While the letter Becky received with flowers was mentioned briefly earlier in the text, its full contents were never revealed. It’s possible Becky forged the letter—she is talented at penmanship and ghostwrote most of Rawdon’s letters. And if it’s genuine, Becky helped Amelia live a lie by hiding the truth about George from her. Ultimately the authenticity of the letter doesn’t matter—it serves Becky’s purpose of convincing Amelia to let go of George, showing that once again, for Becky, it’s more important to be influential than truthful.