Death Lookup please

[Yettigirl]

Can someone see if they can find the death somewhere between 1841 to 1847 for a Janet Roy Duff (nee Isdale).  Her husband Donald and 2 children Margaret and John emmigrated to New Zealand on the Larkins Ship in 1847 but there was no sign of Janet.  She showed up in the 1841 census so that is why I think she must have died between those years. 
Regards Eileen