I feel bad for my mom

I have 2 older brothers who are jobless. I'm not here to critiquate them but their behaviour towards our mom. As an employee she always took care of us beside our father and lately my father's job had some problems so he didn't make enough money to contribute and my mom took the responsabilty. But what makes things more difficult is that my brothers keep asking her for money to go to the cafe or to play football or to buy things and she sometimes refuses which is totally normal she can't always give them money and also my dad gives 100dh to each one of them from time to time. So when she refuses to give them money they start complaining and telling her bad things and even bad words. She always ends up sad and sometimes angry and i feel so bad for her. But what makes me mad is that they succeed to gaslight her and she ends up explaining her self to them and why she didn't give them the money. I'm the yougest sibling ( daughter) i always try to make things easy for her by helping her at the house and never asking her for money i only take money from my dad to go to the university i study at.