Women tend to also have a lot more social baggage hung on them. It makes me wonder if the evacuation and trauma made it particularly difficult to figure out how to fit in socially in a new place. (I mean as just one element that may have contributed.)
There are studies that show that women internalise emotional traumata much deeper than men, thus have a higher risk of PTSD (Can't remember if this is linked to the on-average better memory of women).
As far as I know this is unrelated to the fact that women are more likely to seek help for mental issues (which would naturally skew the numbers towards women).