Question

How did the narrator decide to go back to the "things"?

Answer 1

The narrator was missing her family and felt like having the things near to her to feel close to the family, so she went to Mrs. Dorling to seek that things, but she didn't behaved right to the narrator and shut the door to her.
The narrator was unsatisfied by the first time, so she went again to that house to get those things.

Answer 2

Explanation:

After war when all things were normal , she started missing her family especially her mother. So she decided to see mrs. Dorling for getting back her mother's belongings from her which would help her to fill the empty space in her heart. But cold and greedy behavior of Mrs dorling made her sad.