« Reply #1 on: Tuesday 12 April 16 08:27 BST (UK) »
Have you tried familyseach.org? A simple search for that name with that exact birth year brings up a couple of Christenings. A broader search brings up a lot more, so it depends on if you have any more info on her that help to narrow the possibilities.
The 2 Christening details were: 11 Apr 1739 in Dunchideock, Devon Parents: Thomas Ley and Joan.
and 19 July 1739 in Poltimore, Devon Parents: Jonathan Ley and Elizabeth.
Prangnell, Chapman, How, Mumford, Henwood, Owen, Wormald, Robins, Bendall, Turner, Ayton, Watts, Baker, Wiltshire, Longman, Moody, Talbot.