If she has herself and 2 dependent children on her 2021 return, her 3rd stimulus payment should total $4200. If she received $2800, that is the amount you should enter when asked how much did she receive. You should enter exactly what she received. If she did receive $2800, she would qualify for a recovery rebate of $1400.
If and when you file a tax return, but don't claim the child you received a stimulus payment for, TurboTax will tell you that you received more than you qualified for. But you do not have to pay that $$ back, but you also won't receive any additional stimulus or recovery rebate. See Q E-15
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