Later pattern purveyors copied her designs. The Vickery magazines of Augusta, Maine published the Tulip at the top of the page in the early 20th century. It's #43.83 in my Encyclopedia of Applique---an odd composition.
Yet I did find a sampler dated 1857 with a similar design.
For James Chauncey Murch
West Alexander, Pennsylvania, 1857
The first sketches in Bergen's article are two designs named Biloxi, which she collected from an ethnologist who had obtained them from a man of the Biloxi tribe in Mississippi. He had drawn them from quilts his wife had made.
Both Biloxi designs are in BlockBase
That's a long chain of information. One would rather read that Bergen had actually interviewed the quiltmaker, but she seems to have been handicapped by a spinal problem. I would imagine much of her information gathering was by letter.
Educated at Ohio's Antioch College, Bergen was a well-respected collector of folk sayings and beliefs who published extensively about superstitions and customs. She was particularly interested in horticultural beliefs. Her husband Joseph Young Bergen, another Antioch alum, was a botanist and they collaborated on several books. The Bergens spent much of their life in Cambridge, Massachusetts where John was a teacher. Their son Thomas Dickerson Bergen was also an author who wrote about Italian literature.
From the Iowa Project & the Quilt Index, by Mrs. Schrack or Mrs. Savage