Why would you amend? If you are the custodial parent(s) then you claim the child and mail your return. Was your 2019 return rejected when you tried to e-file it? E-filing is now closed for 2019 returns anyhow. But if you are the ones who can claim her then you MAIL your 2019 return so that it will be hand processed by the IRS.
And....for 2020...
The stimulus check is an advance on a credit you can receive on your 2020 tax return. If something went wrong or you did not get the stimulus check this year, you can get it when you file your 2020 return in early 2021—if you are eligible.It will end up on line 30 of your 2020 Form 1040.
https://www.irs.gov/newsroom/economic-impact-payment-information-center-topic-j-reconciling-on-your-...
https://www.irs.gov/coronavirus/coronavirus-tax-relief-and-economic-impact-payments-for-individuals-...
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