Dazzling,
I also had the same problem though I was having trouble starting to invest, with the same excuses!
12 months ago with a lot of convincing and a little from her father, we went halves in a block of land with my wifes sister.
After 12 months the land has been a good learning curve for her, even though it is not a positively geared property, she actually listens to me when I start talking about it.
And now we are actively researching propertys together, talking about selling the land and putting the profits towards an investment property due to her now seeing that investing for our financial future can be achieved.
hope this helps,
doggie.