Why did spooky appear as mrs guff at the professor 's house?

Spooky appeared as Mrs. Guff at the professor's house to gather information and observe the professor's activities without revealing her true identity. By impersonating someone familiar to the professor, she could move undetected and gain insight into his research or plans. This tactic allowed her to manipulate the situation to her advantage while maintaining her cover. Ultimately, it highlights her cunning and resourcefulness in achieving her objectives.