You both will need to file amended returns for 2019 if you did not meet the requirements to be claimed as a dependent.
Based upon your income level, you should not have been claimed by your mom as a dependent. You should talk to her and amend her return and yours if you have already filed your return for 2019.
The stimulus checks are based upon your 2019 tax returns, or if you have not filed your 2019 return yet, your 2018 tax return.
However, since you were claimed as a dependent in 2019, you would not be eligible for a stimulus check based upon the current filing the IRS has. (see 2nd link below)
I recommend checking the following IRS link for updates. But at this point, the IRS is not taking calls in regards to the stimulus check.
Stimulus payment information from the IRS
Stimulus check calculator
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