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This is my question:
We have 9 children.

I had #9 July 2019 when #1 (who was 20 ) moved out- but she was a dependant up until then and was claimed as a dependant on our 2018 taxes.
We filed for our taxes for 2019 and did not claim her back in March. She also did her own taxes and did not file as a dependant in March.

We received our stimulus but cannot determine if it is sans #1 dependant or sans #9.

#1 still has not received her stimulus & status shows as "Cannot determine eligibility".

How do we find out which year they processed for taxes to calculate our stimulus, and if they credited us already for 2018 taxes but her taxes show she is eligible for the stimulus through her 2019 filings- how would that work? Also do  you know the cuttoff date you had to get your taxes in by in order for them to go by the 2019 filings?