I am also looking for her parents. She and her husband are mentioned in the will of Francis Gurney - "GURNEY, FRANCIS. Phila. Merchant. May 8, 1815. June 1, 1815.6.64. To Francis Gurney Roche, son of Edward and Maria Roche.To Elizabeth Roche, daughter of said Edward and Maria.To relation Maria and to her husband, Edward B. Roche."
Francis is my ancestor and I am searching for his parents with no luck. I decided to follow-up on the names in his will, but have not been able to make a connection yet. It sounds as if Maria might be his neice.
Francis and wife Mary Porterfield were also married in Old Swedes Church.