Have you hated your mother for not allowing you to go with your friends? Have you hated her for letting you not have a boyfriend/girlfriend at your young age? Have you hated her for making simple problems difficult? Have you hated her for having you to go to a different school just because you can't concentrate on your studies because of your friends?
But, had she hated you for doing all of these things? No, right? She never did. She IS lying if she tell you this: "I don't want you anymore. So go away!". She would never hate her own son/daughter that came from her womb. She would never. She did that for this SAME, old reason: TO MAKE YOU SUCCESSFUL. She wanted you to have a brighter future, so that if you grow up, you'll be happy and all. But how can that be possible if you won't make it to? She's the one to make it to. Even though it hurts, for her, that's the only solution she can make.
She bought you all you you needed. In school, at home, and everything else. Even if you don't need it but want it, she would buy that just to make you happy. She would work hard for you to have what you want, even if it isn't necessary. So, how would you make her happy after all the things she'd done to you?
That's simply. Make her feel special on this day, Mothers' Day. Make her feel like this would be her happiest day on Earth. No gifts needed, just make her happy in your simple ways. Do what will make her happy, even if it's hard, think that it's for the person who would risk her life just to make you happy. So sacrifice for just even a day, today.. And tell her: "I LOVE YOU." THAT would make her happy. :).
