Yes. If she made less than 4300 you can claim her and you can get the 1400 Stimulus for her even if she already got it.
You only enter the Stimulus payment you actually got. Then you will get the Stimulus for the dependent you are adding if you qualify and your income isn't too high. You do not report the Stimulus payment they got or anyone else got for them. They can keep the payment they got. They don't have to return it.
You can really get it now. It is based on 2021 return. It's legit. Their 2020 return was just used to send out the checks fast. It's a IRS loophole.
See Question 15 here
2021 Recovery Rebate Credit — Topic E: Calculating the 2021 Recovery Rebate Credit | Internal Revenu...
