The correct answer to this open question is the following.
Unfortunately, you did not include the excerpt from "The Most Famous Woman in America."
Without the excerpt, we do not know the content of it. We need it to help you to answer your question.
However, trying to help you, we did some deep research and can comment on the following.
The excerpt says:
"He had charge of the meeting. He was followed by a lady. She was small and had dark eyes and hair. Her hair was pleasant and kind. The instant she appeared there was a thunder of applause."
So the sentence that is an opinion in the excerpt is "Her hair was pleasant and kind." This is correct because to the narrator, the lady had kind of hair. The narrator gives his personal opinion about how he/she is interpreting the way her hair looks.
The other sentences are just simply descriptions of the actions that were happening but never express an opinion.
