The "We" adds to the development of the <em>author’s message</em> to show that <u>everyone has a role to play.</u>
Your question is incomplete as you didn't provide the author's message. An overview of the answer will be provided.
An <em>author's message </em>simply means the big idea that's in a text. It is what the author wants the readers to know. It is sometimes the lesson that the author wants others to know.
In this case, since the emphasis is on "we", it means that the author wants everyone to do that particular thing that's addressed in the story. For example, if the message is about love, the author can write that we should <em>love</em> each other.
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She went to the open door and stood in it and looked out among the tomato vines and “jimpson” weeds that constituted the garden.
That sentence helps the reader infer that it is summertime, because it shows that the garden is flourishing.
