Which female garden designer frequently worked with architect Edwin Lutyens?

The correct choice is Gertrude Jekyll, a prominent garden designer known for her collaborative work with the noted architect Edwin Lutyens during the early 20th century. Jekyll's expertise in horticulture and her understanding of color and design played a significant role in creating harmonious landscapes that complemented Lutyens's architectural projects. Their partnership resulted in numerous renowned gardens that are admired for their beauty and integration with the surrounding architecture.

Jekyll's ability to design gardens that adapted to the specific qualities of the landscape, while also reflecting the Arts and Crafts movement's values, cemented her legacy in the world of garden design. Her innovative approaches to planting schemes and her influence on the aesthetic of garden layouts have left a lasting impact, making her one of the most notable figures in the field.

The other designers listed may have their own unique contributions to gardening, but none are known for the significant partnership with Lutyens that characterized Jekyll's work.