Looking at the 1851C it looks, well at least to me, more like Rumburgh, next to Halesworth.
I have looked through the transcripts I have for that parish & only found one Amy around that time Amy Stern, daug of John & Ester, unfortunately she was bpt in Jun 1773 & buried in Dec 1773 so that excludes her. The next child born to that couple was a Harriet in 1774. A Harriet Starn married in Chediston in 1801. No marriage anything like Francis Butler to an Amy between 1790-1810 in the parish of Rumburgh either.
In case you don't have the info:
Amy Butler of Chediston Street, buried 15 Jun 1859 (85) Halesworth cemetery.
Francis Butler, labourer of Chediston Street, buried 14 Mar 1859, Halesworth Cemetery.
Good luck
Keziah