Jane was the daughter of William Crouch and Constance Manser (or Maunser).
Benjamine Wall (see theclergydatabase.org.uk) was educated at Oxford and was a preacher/Curate/Rector in various locations in Sussex until 8 August 1692. After which I have not found him.
https://theclergydatabase.org.uk/jsp/persons/index.jspWilliam Crouch (husband of Constance) signed his will on 22 Jul 1702 - in his will he does not name his daughter (Constance Wall), nor his son, William, Jr., but he does name his granddaughter - Constance Wall. As you note, Stephen Coney was named as the guardian to his granddaughter.
I don't believe that the rector at Monmouth was the same Benjamin Wall as the other was alive and living in Sussex at the time.
I am, like you, interested in finding out what happened to her parents.