Hi Elaine - I don't have Eliz. Briggs and Richard Keeton in my records.
I do have George Briggs marrying Elizabeth Norman in 1698 at St. Alkmunds Duffield Parish. Could this George Briggs be your Elizabeth's father?
I have the St. Alkmund's deaths/burials 1696 - present. I also have a list of those buried there in the 1500s. Still looking for those buried there from 1100 to 1533. Imagine they are among the 80+ people buried in the underground crypts under the church which were cemented over in 1847.
If you'd like a copy of the burial lists, shoot me an email at firstname.lastname@example.org.