What could be the theme of this poem?

Of

A Poem for My Librarian, Mrs. Long

admiration

Explanation:

Giovanni shows us a woman who acted as a mother and educator, a woman who nurtured the intellect and courage of the poet - and activist-to-be. But Giovanni's admiration is not limited to her amazing librarian; there's also a feeling of gratitude and nostalgia for the time and place.