This is an interesting question. My mother was very neglectful when I was growing up. She didn't share any love and if you cried or showed any emotion at all-she would totally dismiss it.
I've bought gifts for people in the past on mothers day that I clung to. Different older women in my life that I casted the "role" of mother to. of course those relationships were ruined cause I sucked the life out of them.

Sorry went of base-but to answer your question. Im not buying my mother a gift but I am cooking for her. But there is a method behind the madness. I secretly have a goal to try and show her what taking care of someone should look like.