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Your spouse MAY apply for spousal benefit - that is not an issue.
But since she will receive social security benefits - that is not counted as delay of her own benefits - and her benefits will NOT be recalculate when she chooses to elect her own earned benefit.
See here - Benefits For You As A Spouse
If you qualify for retirement benefits on your own record, we will pay you that amount first. But if you also qualify for a higher amount as a spouse, you will get a combination of benefits that equals that higher amount. Your application will include both benefits.
So - if your spouse want her benefits to be recalculated at the later age - she should NOT receive social security benefits till that age.
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