I'm not sure if this applies to many other ladies, but emphasizing the pleasures of private flying over the general interest in all things aviation may, just may!, help.
I think that is certainly true; for example on one of the early trips I did with my girlfriend we went away to an island on the west coast of Scotland just for a little time together away from things - something that I know she feels we don't always get enough of. It was a good way of introducing her to my slightly mysterious hobby and generally left her with a good impression of flying.
Subsequently she has come to with me to Marseille and also a trip from our place in Scotland down to London for a weekend. She's always been supportive, even on the occasion once when we had to delay a trip by a day due to fog at the airfield. By taking her places I think it keeps a purpose to flying which means she is more likely to view it in a favourable light.