Aunt Jennifer's hands are 'fluttering through her wool' because she is an old lady on whom age has taken its toll. The fluttering of Aunt Jennifer's fingers also signifies her oppressed mental condition which makes it difficult for her to even pull an ivory needle while embroidering.
Aunt Jennifer’s fingers fluttering through her wool
Find even the ivory needle hard to pull. The massive
weight of wedding band Uncle's
sits heavily upon Aunt Jennifer’s hand.