Simple answer: no, because her retirement income is not "compensation" (earned income).
However, if you have earned income and you file a joint return, with her, you may count some of your earned income to qualify her for a contribution and deduction. You must have sufficient earned income to cover both her and your contributions. For example; if you have $10,000 of wages and contribute $5500 to you own IRA, you would only be allowed to contribute $4500 to hers (10,000 - 5500 = 4500)