Being good is a learned behavior and I would help the man in the well! Hope this helps :)
Somebody cannot answer this unless they have seen the cartoon this question is asking about.
Answer: The adverb slowly describes the verb walked. It basically says HOW the person walks (like did they walk fast, slow, at an average pace, etc., and in this case, it says that they walked in a slow manner).
Edit: so I’m assuming effect is like the mood of the story created, and I’d say that it creates a somber, suspenseful feeling, opposed to if she was walking quickly, which would create a rushed mood.
The literary work that "formally" announced the establishment of the romantic revolt in english poetry is lyrical ballad.