No, you do not have to add her 2020 Social Security to this year's tax return or amend your prior year. Since the IRS has already made the adjustment and you accepted it, no further action needs to be done on your part.
However, you do want to make sure you include her Social Security she received in 2021 on your return if you are filing jointly again. This can be done using the steps outlined by @DoninGA. There should be a column for each of you to put in your separate SSA-1099 information.
