For 2020, the principal benefit of her being able to claim herself is the $1800 (1200 + 600) stimulus/rebate credit.
As to the American Opportunity Credit (AOC), there is a 4 time limit and you have probably already used all 4. Either of you* can claim the education credit (the Lifetime Learning Credit if all 4 AOCs have been used) but based on income and tax liability, you would probably come out better.
*For a student under 24, there is an earned income requirement for the refundable portion of the AOC. But if she meets the support test for claiming herself, she probably meets the earned income support test for the AOC too.
