"Things only have meaning in context"
You can see this from the examples that Dickenson lists.
"Land by oceans past" - You would not be able to tell the land if there were no oceans
"Peace by its battles told" - How would we have a definition for peace without battles?
Answer: 11.
Explanation: I think it's talking about 4 years earlier so then she was 7. 4 years later she'd be 11 and Darren would be 7.
In a way that cannot be controlled