If she was under 24 on 12/31/2020 and a full time student you could claim her no matter how much she made. But since she is over 23 you can still claim her if she made less than $4,300 for the year. So you're ok. You might still be able to claim her in 2021 if she made less than 4,300.
See IRS Publication 501 starting on page 10 bottom Dependents
https://www.irs.gov/pub/irs-pdf/p501.pdf
Who can I claim as a dependent?
https://ttlc.intuit.com/community/credits-and-deductions/help/who-can-i-claim-as-my-dependent/00/267...
Who you can claim article
https://turbotax.intuit.com/tax-tips/family/rules-for-claiming-a-dependent-on-your-tax-return/L8LODb...
