Final answer:
Hannah responded with contemplation and silence when Rachel declared she would be her best friend.
Step-by-step explanation:
Hannah responded with silence and contemplation when Rachel declared she would be her best friend. In the given passage, Marjorie made no answer but gazed pensively at her own image in the mirror.
This response indicates that Hannah did not immediately accept or reject Rachel's declaration, but instead took some time to reflect on the situation.