My mom is so ungrateful

Hello people, I am so mad at my mom and i don't know how to deal with her. I give her 50/100/150 euros very often and she never says thankyou or seems happy about it. She always says "thats what you are supposed to do". I always try not to be mad, but today she went to far. So we had a fight and i bought her a dress 49.99 euros, its not about the price but just so you guys have an idea about the situation. She was working when i came home so i left in on the couch. When she came, my father asked her "what is that dress?" and my mom told him "throw it upstairs. Oke i thought i will not make a big deal out of it and we made up. But later on when she went upstairs (and it was the end of the day) she didn't even look at it!!!!!! Im so mad and i have the same issues with my little sister(19). I just really don't know how to deal with ungrateful people because it makes me so angry. But being this angry is costing me too much energy!! Sorry for my bad English, it is my third language.