Robert Davis and his wife Elizabeth gave issue at Tilshead to the following known children>
Robert Davis christened 19th November 1669;
John Davis christened 27th January 1671;
Elizabeth Davis christened 18th January 1673;and
Elizabeth Davis christened 28th September 1676
I presume that the first Elizabeth died sometime in the period 1673 to 1676, so the Elizabeth
you are seeking is the second one, which basically clarifies your post. It should be noted of John that he gave issue with his wife
Susanah to a son John who was christened at Tishead 28th September 1693.
There is only one other listing for Davis at Tilshead that I can see being a marriage of a Thomas
to Esther Fletcher on 22nd October 1749.
I would be inclined to check other surrounding places for other Davis entries.....
Furthering this there is one document at Wiltshire County Council which I quote ad fin et item>
P2/D/406 Inventory, will 1696 Davis, Robert Blacksmith Tilshead
and I would contact WCC direct to acquire that as other information may come to light....
Best I can offer.
Please note that there are 13 entries for Duke family on WCC site two of which pertain to a "John", and the references indicate places probably worth investigating for genealogical structures.....
there are approximately 1310 entries for the Duke family on familysearch.org in a variety of places throughout Wiltshire and I would actually database those into some sense of dated order to see if you can see the most likely of structures... However , I would look on a map as well to see which are closest etc......
good luck