I'd appreciate any suggestions on how to track down my GGM's maiden name.
The background is that my GGF, David Gravel(l)(e) b 1862/3 married his wife 'Sarah' b 1861/2 around 1884. The 1891 census shows that their first son was born in 1885. It's possible that some records show their Welsh names (Dafydd, Sara) but Ancestry.co.uk hasn't turned up anything new for these.
What I know from the first married census record in 1891 is that David was born in Pembrey, Wales and Sarah was born in Pontargothi, a small village in Camarthenshire, Wales. In subsequent censuses, Sarah gave her birthplace as Llanegwad, a larger village close by, which has either subsumed Pontargothi or is more recognisable to census officials.
From their headstone, I also know the exact dates of their deaths (David in 1918, Sarah in 1925).
I've narrowed the 'Sarah' maiden name options down to 2 or 3: a Sarah Lloyd, a Sarah Phillips and a Sarah Thomas, all born in Llanegwad around 1861. But there might be more

.
So I know approximately when and where Sarah was born and exactly when and where she died. Similarly I know approximately where and when her husband was born and exactly when he died.
The dates of their children's births is approximate (from census info). All approximations are +/- 1 year. What I don't know is the exact date that they were married though 1884 sounds reasonable (based on the birth of their first child).
So to find out my GGM'd maiden name, I have 4 approaches in mind:
1. Do more deductive work (to remove alternatives)
2. Get the death certificate for my GGG (but would this include her maiden name?)
3. Get a birth certificate for one of their children (but would this include her maiden name?)
4. Try and look up parish records for the village where they were buried
Option 2 sounds the easiest but I read connflicting reports of whether the deceased female is described in relation to her father (long deceased) or to her spouse.
I read option 3 on rootschat
http://www.rootschat.com/forum/index.php?topic=187109.0 but the GRO info doesn't confirm this.
Thanks for any tips and advice!
Mike