Unless I'm mistaken, medical expenses, like donation receipts, are a non-refundable tax credit, meaning they reduce the amount of income tax you pay. While you wife would have a lower threshold for claiming expenses, since she had no income, she also would not have paid any income tax. As a result, there is no income tax against which she could claim the tax credit. This is likely why the program is suggesting you should be claiming them.
Do you pay your premiums on your medical insurance, either directly, or through payroll deductions? If so, those premiums can be claimed as medical expenses, along with any deductible you've had to pay for medical services or prescriptions.
