Final answer:
In Mary Shelley's novel 'Frankenstein,' the image that came to her in a dream is that of Victor Frankenstein creating the monster in his laboratory.
Step-by-step explanation:
In Mary Shelley's novel 'Frankenstein,' the image that came to her in a dream is that of Victor Frankenstein creating the monster in his laboratory. This dream inspired the famous scene in the novel where Victor brings his creation to life.