Why is my mom yelling at me?

So the whole argument started when we went to eat. I gave the cashier 72 cents change because i accidently dropped all coins into the tip jar. I didn't want to grab it again because it was rude. Then my mom started yelling at me and how i think money grows from trees. I told her what happened but she wouldn't believe and said, " No excuses". Then THE most STUPID argument happened. We both share drinks so when i drank most of it she got rlly pissed at me. She said when i gave it to her i drank all of it because all she could see was the ice inside and only gave her the trash so she threw it onto the floor and all the lemonade was on the floor because it was still half full. Remember, her eyes are 700 degrees so she's almost blind. I told her if it was so empty like she said it was, why was there lemonade ALL over the floor. She said it's cuz i drank like 90% of the drink??? wtf. So i cleaned up the floor while she was ranting on how she's always doing hard work, in the house and at work and how we don't appreciate her enough and how we think money grows on trees. Also, if she's mad at one of us, she's mad at both me and my sister so she yelled at ehr too. I mean, the lemonade got from the kitchen all over to the dining room and living room. Isn't that ironic? So WHY is she so sensitive now?