Hi,
I am not sure what you have on the Triptree Family so will post a little of what I have found.
1851 Census Elizabeth Davis has her unm Sister MARY Triptree born c 1789 Yeovil with her.
Mary TRIPTREE Baptised 10 May 1789, St John, Yeovil
Parents HENRY/ELIZABETH
Cant find a Elizabeth 1787 to them but other Children Baptised same Church are;
SARAH, 20 Oct 1784
ANN, 12 April 1791
HENRY, 11 March 1793
HARRIETT, 22 April 1795
WILLIAM, 17 December 1796
Henry TRIPTREE Married Betty BODINGHAM, 24 May 1784 St John
Now strangely there is this Baptism same Church;
*liza BODINGHAM, 28 Nov 1784, Parents Henry/Betty
Maybe this is a mistake by the Pastor and is your Elizabeth Triptree?
All above on FreeREG
Trish

EDIT, I did notice in the 1841 Census William Davis age 55 is not born in County
A Margaret BODINGHAM Married Amos TUCKER, 24 April 1782, St John, Yeovil, justt before Henry Triptree Marred Elizabeth Bodinghan 1784, she was of Frome St. Quinton.