Answer:
Their mother drives them to the park every day during the summer.
Yes, commas are used for clauses that help to provide a fuller picture, even when not necessary. Dashes can be used for a similar purpose as they are used here, but i don't believe it's appropriate in this sentence. Parentheses can only be used for information that can be completely written off without having any effect on the sentence.
Answer:
Visualizing
Explanation:
She is making a picture of what is happening in the book in her head.
