My mother claimed me on her taxes thought I do not live with her, which stops me from getting a stimulus check, what do I do?

[DeanM15]

The stimulus payment is an advance on a tax credit for the 2020 tax year. If you are a dependent in 2019, but not in 2020, you will not receive a stimulus payment this year, but will receive one when you file your taxes next year. 

If you and your mother amend your 2019 tax returns, you would not get the payment until after the return has processed. The IRS is not currently processing mail-in returns and amended returns are mail-in. Generally, a mail-in amended return takes 6 weeks to process, but at this point, it is impossible to tell how long it would take.

[NCperson]

your mother would need to amend her return.

you could still be a dependent if the reason you do not live with her is that you are away at school.