What do we understand from the …

The poet expresses the inner feelings of a woman - Aunt Jennifer. The aunt is embroidering a motif comprising of energetic, fearless tigers moving freely around the bright greenery.
She is living a life of submissiveness to her husband’s command. Her acts are dominated by him and she fears him constantly. This pattern of the free and fearless tigers reflects her inner desire to live a free and fearless life. The tigers are graceful, elegant and bright.
Aunt Jennifer’s fingers tremble as she embroiders. She is old but still fears her husband. She does not enjoy the freedom to do anything as per her wish. She is scared doing the embroidery too and fears his wrath. Since the day she got married, she has been fulfilling the demands of her husband. The wedding ring on her hand is a constant reminder that she belongs to her husband. The burden of the demanding marriage has exhausted her. The torment will not end until her death.
Even after her death, the ring will remain on her hand and she will never be free. On the other hand, the tigers that she is embroidering will continue to move around freely forever. Her desire of freedom and fearlessness will live on through her tigers.