My mom claimed me as a dependent in 2019 tax return, she has not filed in 2020 yet. I filled as a independent in 2020. She got 2800 stim and I got 1400. What should I do?

My mom got the extra dependent credit for stimulus because in 2019 she claimed me, and she hasn't filled in 2020 yet. I got my stimulus check because I filled in 2020 as an independent. This year she is going to file as single. What should I do in this situation? I called IRS but lady was unable to help.