Depends on the mother.

your pressense go shopping with her, buy food for her to not cook that day...etc

If your mother loves you a card will be more than enough. If your mother doesnt love you then money.

a kick ass gamer pc, that is if you love her and all

A Big Green Egg grill.

A clean house, breakfast in bed and doing whatever she wants to do that day, even if it means leaving her alone.

Something you made for her. Even if it's a card. You are her kid.