Your Susan Copeman was living in Wreningham along side my Copeman family but as yet I have found no connection between them. However I have forwarded a copy of your message onto a David Rawlings - I believe he is also descendant of Jeremiah Thomson and Susan Copeman.
He has details of Thomas' parents and grandparents!
I have a copy of all the Copeman's listed in Wreningham in the 1851 census - there were quite a few of them.
You might be interested to know that a Susan Copeman aged 78 was living with her son-in-law Jeremiah Thompson in 1851.
You may also wish to look up a book called 'Past-times at Wreningham' by Basil Day. Mr Day's family were from Wreningham and his book lists all the gravestones in Wreningham church and has information on all of the families living there in the mid-late 1800's.
Hope this helps. Susan