Just a little bit of consideration

I don't why is it that I'm so sad if the ones involved in the problem haven't said anything to me.
Today is the father's day and my husband received a gift from me, and a gift from his mother. My mother was absolutely absent in gifts.
Last Wednesday, I was talking with my mother while showing her what I have bought to my father and husband, and she told me that was determined not to buy anything neither for my father nor for my husband. When she said that, I instantly thought that my father wouldn't receive a gift just because my mother didn't want to buy anything for my husband. Facing her determination, I just said: "Have just a little bit of consideration, and think who pays for your mother's days, and birthdays gifts."
My younger brother who was also there, agreed with me and said that she was being mean, and that she should not behave in that way.
She just said: "You are obliging me to go downtown next Friday, and it's going to be a nightmare"
The whole issue stayed there, but I thought she understood that I was referring to both fathers in the family.
Apparently, I was not clear enough.
On Friday I went to her house and she showed me lots of bags with things she had bought that morning. There was my father's gift, but nothing for my husband.
I didn't say anything because I thought she would buy something little and cheap for him on Saturday when she would go to the supermarket. I thought, "OK, maybe she will buy a cologne or something like that. After all, it is just the intention"
Today we went to her house and she was preparing the barbecue. When she came to the kitchen where I was preparing the salads, I asked her in a whisper:"Did you buy something for Gonzalo?". She answered with a denying face: " Did I have to?" I just gave her a smile and said nothing.
The funny part is that after that she was angry. I didn't want to look at her.
I was frustrated. My husband's mother is a real witch with me, but she always gives me something for my birthday and for mother's day. This is not the first time my mother doesn't give anything to my husband for special occasions. I know they don't have a good relationship, but a symbolic gift would have been enough to me. She should have done for me, not for my husband.
I wonder what she would feel if my brother's future wife didn't give her anything just for the same reason she doesn't: "He/She is not my father/mother!"
My God, what kind of answer is that?
I know I may be wrong, I'm always opened to the possibility of being wrong. But I feel I cannot discuss anything with her. She is so close-minded. Sometimes I want to punch her on her face, and make her react.
Please God...Help me not to care!
I can't stand her reactions, and it is worse when I think that she goes to mass every Saturday to pray God, and play the part of a good religious person.
How can you be devoted to God if you set the limit of that to one weekly hour, and you are so mean with people around you?
The thing is that my husband didn't say anything, because I know he doesn't care about receiving gifts. However, as I previously said, it's not that I needed her to spend a big amount, it's not an empty materialism in me speaking. Everything I feel now is limited to my mother's lack of consideration in not maintaining the symbolism of giving a gift to the responsible of her grand-motherhood.