Why does Rennie want the war to end in the book Tallgrass

The theme of the book is that the life is very unpredictable even when it seems to be the safest

Explanation:

The story of the book Tall grass revolves around a 13 year old  girl Rennie strourd  and her family.Immediately  after the  Pearl Harbor incident , the U.S. government shifted  all the Japanese residents to the West Coast and shipped them off to "internment camps" for the duration of the war. One of such camps is Tallgrass.

During  the world war II ,  Rennie  has witnessed a murder, and had two of her best friends raped,  and is trying to cope with a sick mother(who is a heart patient) and a brother in a German POW camp. Rennie very soon discovers the bitter truth of life (i.e. life is all about  betrayal, lies and the keeping of secrets)

This is the reason why Rennie wants the war to end

the mending wall was written by robert frost