From the spacetime topological perspective, would this make her the first human Klein bottle?
This may be taking your question too literally, but hey, this is Slashdot. Currently, the best chance of actually preserving your wife's memories is cryopreservation, through an organization such as Alcor. This is, of course, a huge long shot -- but there is a small chance that something like this might work, so it's worth considering. Another up-and-coming technique for preservation is brain plastination.