@Yandongyuan - sorry, I am slightly confused by your answer.... I assume you mean she is your dependent for both 2019 and 2020.
to "do the right thing", i would suggest she sent the money back to the IRS with a brief note and a copy of her tax return stating she inadvertently failed to check the box that she could be claimed by someone else and therefore is returning the stimulus money
you can google the address as it is state dependent.... google "IRS ADDRESS <<MY STATE>>" it'll tell you the mailing address for your state if a check is enclosed. If she received a check from the IRS just write void on it and stick it in the enveope. if she received direct deposit, just make out the check payable to the US TREASURY and place her SS# on the check.
PS: you can certainly make a decision to not claim her in 2020. That is your right. But her responsibility is different. She is asked, as we all are, CAN someone else claim you? that is factual and doesn't change whether or not you decide to claim her. The question she is asked is NOT, "DID someone claim you?" see the difference?
does that help?
