Tone In The Poem 'History'

The diction in the poem “History” initially conveys an objective tone that shifts to a playfully mischievous tone which then transitions to a morbidly depressing tone.
In the beginning of the poem, the speaker describes Grandma with eyes that are “small with sleep” and how she crushes chiles with a “stone brought from Guadalajara.”
The way the speaker depicts Grandma’s eyes can be described as neutral and factual.
The Guadalajaran stone represents Grandma’s past history, hence the title of the poem.
Despite her tiredness, Grandma is still determined to get a head start on her daily routine which emphasizes her hardworking nature.
The speaker’s tone begins to change the moment Grandma reveals her “secret cigar box” and pulls “tiny chocolates”