Is your wife a W-2 employee? If so, W-2 job related expenses are no longer deductible as of the 2018 tax year. Not a penny.
If she's self-employed and does this driving for a business she owns and reports on SCH C as a part of your personal 1040 joint tax return, then I can help with the transition reporting, assuming you claim the vehicle "per mile" deduction on SCH C also.