Here's why:
* She is known for her intricate and beautiful embroidery: The text describes her work as "exquisite" and "wonderful". She creates elaborate pieces, including the scarlet letter "A" that she wears.
* Her skill in needlework is her livelihood: She earns a living by embroidering for the wealthy people of the town, often with religious imagery.
* It becomes a symbol of her skill and resilience: Her embroidery is a way to express her creativity and artistry, even while facing social ostracism and judgement.
While Hester has other qualities, such as her intelligence, strength, and defiance, her embroidery is a defining talent that is both personal and symbolic in the novel.