"a week after the stimulus checks were rolling out in mid April"

Check, or Direct Deposit Refund? That matters. Also, since 2019 is likely not reviewed, her 2018 status probably is being used, which is why you see: "keeps reflecting that her information is being reviewed or she may not be eligible for payment"

As you can see, here:

https://www.fool.com/investing/2020/04/21/heres-precisely-when-youll-get-your-stimulus-check.aspx

She likely missed the first window due to the change in status from 2018 to 2019.