Yes, the 1851 that you have found does seem to be quite a possibility - esp with the link with Surrey/Sth London
But there is more to it than you listed!
HO107 1918 582 24
Adelaide Street , Madron
Eliza Ann Cook Hocking 36 widow bn Bermonsey
Richard 15 shoemaker bn Penzance
George 12 blacksmith bn Bermonsey
Henry 7 bn Penzance
William 2 bn Penzance
James J 10 mths bn Penzance
So unless there was a bit of hanky panky going on, Eliza must have only recently been widowed, well within the previous 19 months.