Which of these excerpts from the end of the poem suggests that imogen has reconciled herself to her situation
a. and there was janes sister and the mother.—her sister, and the mother of them all
b. they were not hers, not even one of them: / she has not born to be so much as that
c. for she was born to be aunt imogen
d. now she could make stars out where once had palled / a futures emptiness

The excerpt from the end of the poem that suggests that Imogen has reconciled herself to her situation in life  is She was not born to be so much as that For she was born to be Aunt Imogen Now she could make stars out where once had palled.

In this excerpt Imogen accepts that she will always be an  aunt, not a mother. She realizes she it is high time she lifted  the cloth (pall) that had once not allowed to see the brightness of her situation (stars).  

what is a theme?

ans: the implicit idea of a written work of literature is called a theme.

so, the only theme of "birdfoot's grampa" by joseph bruchuc is that as a human being one should always remember the value of every life on earth.

the grampa is stopping the car again and again to save those little toads from washing away in the heavy rain is an act of kindness and humanity.