there will no douub be a lot of information on the house fire and Jenny's tragic death in the local Spalding newspaper, it would have probably been covered over a number of weeks including the funeral and the coroners inquest. It probably would have been in a county paper too which you will be able to look up in the Local Studies Library in Spalding. The burial would probably have been in the graveyard of the Church they were married in, there are at least 4 possibles in Spalding, but it is also possible she was buried in the civic cemetary, which you can easily check as there will be a computerised surname index with Spalding Council.