Because you are paying for more than half of your own support and not living with her, your mother could not claim you as her dependent.
You can claim as independent and use your mother's address to file your tax return. Make sure that she knows that you are using her address. When you file your 2020 taxes, select the option that no other person can claim you as a dependent. Make sure that your mother does not claim you as a dependent for 2020 taxes.
Also make sure to tell TurboTax that you did not receive the first and second stimulus payments, as you will be eligible to claim those payments with your 2020 tax return, even if your mother received them last year.
