What does the poet’s smile in the poem ‘My Mother at Sixty-Six’ show?

The poet’s smile is a deliberate attempt to hide her anxiety and fear of losing her mother and the final separation. Alternatively, it also shows that the poet hopes to see her mother again soon.

OR

The poet’s smile in the poem shows that she is trying to mask her feelings. She is feeling guilty for leaving her mother at that critical fracture. She smiles to reassure herself and her mother that they would meet soon.