My mom just keeps relapsing back into drinking and drugs and I think I'm going to just give up on her.
Why are you going to give up on her? Has it been hard on you?
I'm just so disappointed in her and I'm tired of trying.
If it has happened a lot then I get being tired of trying but as long as she's willing to try to quit you should stay loyal and help her. She's your mother and she cared for you in your worst and best, try to do the same for her.
I don't know if she'll ever change, though.
I understand how tough it can be, but I think you should be willing to give her another chance. It's not easy to stop drinking and doing drugs, but I think with your help your mother will be able to do it.