Since your income is not taxable in India, transfer of funds to your NRE Account is not taxable provided the same is not received directly from your employer in to Indian Bank Account.
Transfer from your NRE account to your wife's account to may be treated as loan given to her or gift given to her. In both cases it does not result in any income to her. Hence there is no tax implication to any of you.
It is possible that there may be a query to your wife for the amounts credited to to her account. However, the same can be explained with facts.
Interest received by her on the amounts transferred by you to her account may be clubbed in your income under clubbing provisions and will be required to show in your income tax return in India, if the interest amount goes above taxable limit.