Mine is starting to come around. This may sound funny or go without saying but avoid any talk about zombies. Yes, we all know that there will never be zombies and that when we talk about zombies it's just an easy way to discuss TEOTWAWKI without describing a specific "event" that triggers it. I made this mistake once and she thought I was crazy. I wasn't being serious but it set me back a couple years in getting her on board. Every time I mentioned prepping she said "oh, in case we get zombies?" Truly what I'm worried about is economic collapse and a subsequent collapse of society. Far from zombies...

Anyway, assuming you are starting from ground zero, start slow. Start by working up to a few days supplies. Remind her what happens before hurricanes. The store shelves empty in mere hours. We have ALL seen that on the news. The same happens here, kind of...We're in Colorado so we can (and do) have winter storms that shut down everything for days. Stores simply don't open. So you should have enough food, water, batteries, light, warmth, extra fuel, etc. in case we do see a storm that big. The power can go out, the roads can be impassible. This a great time to ask for a kerosene heater. That's a bigger item but if your house is anything like mine it can't hold heat worth a ****. Turn your heat off right now and leave it off for this storm to simulate a power outage and I bet by Thursday she'll let you buy one.

What worked for me to get her interested in prepping for more than 3 days...I didn't even base it around an "event" at first. I made it about being frugal.

-Tell her it's a good idea to buy extra food when it's on sale so you save money. Who doesn't like saving money? Little by little...
-Make your food storage just a big pantry. You both will love having everything you need in the house and not having to run out to the store all the time.
-Discuss how the economy worries you and how everything costs more these days. Stock up now before it gets more expensive.
-More people get laid off everyday. You never know if you may be next so you want to prepare by buying food and supplies while you can. So if something does happen and you lose work your family will still be able to eat, etc. If you don't have a grocery bill then it will be easier to keep the roof over your head should jobs be hard to come by.

All these discussions will start to get her thinking about different scenarios and with only a little extra effort you can get her on board for full scale prepping.

And I'll leave it with this...I avoid focusing on doomsday stuff. That seems to get my wife to go the other direction. Leave your reasons for wanting to prep to "just in case of hard times", "to save money", "severe storm", "massive inflation", "economic depression" and the like. Hey, our grandparents did it and they certainly weren't worried about EMPs, mobs or looters. They just wanted to make sure they had everything they needed should they need it.

But if she does read the books mentioned and they scare her then you shouldn't have a problem.