GLE450e's are pretty rare, and probably 'too-big' by the wife since it's closer to X5 in size than the Cayenne.
Given the wife's options (PHEV, SUV of that class, size, no domestics), only the Cayenne fits the bill (maybe that's her end game?
). The other option I can think of is the RX PHEV but that's still too new and $$$.
I think she can acclimatize to the size of an X5, otherwise, would the wife consider one size down? That will open up options like the NX, XC60, X3 30e etc.