October,
If your wife became a Canadian citizen before the age of 18, she may still be a Dutch citizen.
Both my parents came to Canada as kids and became citizens before the age of 18, therefore I was able to gain Dutch citizenship as my Dad was still considered a citizen (I believe it only applies to fathers, not mothers, I don't know why that is).
I went through the Dutch Consulate in Toronto (
http://www.dutchconsulate.toronto.on.ca/). They were very helpful. They send a questionnaire by email to help me figure out my eligibility. I now have dual Canadian/Dutch citizenship and it is wonderful!!
Good luck!