English Matron wearing hat

Photo of an English matron from 1800's. Studio photo. Gown made of wonderfully draped fabric.

Mystery: A mystery relation! Have you seen this woman in your family photo albums? Any advice on narrowing the date of the photograph? Our English ancestral surnames include: VALLIS, PALMER, PICKERING, HEDGES, TAYLOR and CUTLER.
This photo was a treasured keepsake of my great-grandmother, Louisa Ann PALMER VALLIS,born 1858, originally from Swanbourne, Buckinghamshire, England. In 1887, Louisa married John Vallis from Middlesex/Poplar-Millwall. They married in Lincoln, Nebraska USA. Both had relatives who remained in England.