I want my mom to overdose
Why would you want your mom to harm herself?
I'm tired of helping her take care of herself
It's understandable to be frustrated with someone who can't take of themselves, but wishing they'd harm themselves is not okay. They could potentially die from an overdose. Instead, try to reach out to other family members to get help if it's become too much.
I am so tired of all of this, do you know how painful and frustrating it is to watch every day?
If you feel tired of taking care of her you should not wish her dead. You can remove yourself from the situation. Have you tried going to a family members of addicts AA meeting?