My wife is an impulsive buyer and spends a lot of money without thinking twice. Am afraid we are not saving enough. How do I explain her?

Sit and talk it over with your wife. You have to come to an agreement on what your priorities are for the family. It would also help if you could have a breakdown of your income and expenses, and also your target savings on a monthly basis. It would be nice if you could ask her about her thoughts on the current situation of the family. Make her realize what's missing and what could have been if she doesn't stop splurging on unnecessary things. Let her lay down her cards and ask for a concrete action plan that would benefit the entire family and not just one person.