What your wife has is known as a spousal IRA. She can continue to contribute to it as long as you have sufficient earned income from your self-employed business to support the deduction.
When entering the contribution into the system it asks all sorts of questions about the IRA contribution. One of those is "Were you covered by a retirement plan at work?". Go back through the IRA contribution section and make sure that you have checked 'No' on that question.
@fepeter
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