How did the author's father feel when he read her story at the end of ""Only Daughter""?

The authors father felt pride in her work.

Explanation:

Sandra Cisneros was the author and her purpose was to describe her experience as an only daughter in a Mexican-American family and how it had impacted her life. Sandra Cisneros shares her experiences being alone all the time, trying to be noticed as "a writer, not just as a teacher", and always searching for her father's approval. This isolation enabled Cisneros to become a writer motivated by the desire to make her father proud.

So her father was very proud of her works after all that she struggled with.