Here's the high level rule. Since she's not a child under the age of 17, there is no additional stimulus for you despite you claiming her as a deductible.
Most individual adult taxpayers will receive $1,200, plus an additional $500 for each child under 17.
Married couples filing joint tax returns can receive $2,400 plus $500 for each child. The amount of your check will decrease on a sliding scale if your Adjusted Gross Income (AGI) from your most recent tax return exceeds $75,000 for an individual or $150,000 for married couples filing joint tax returns.
