My mom drank some champagne today and after that she started going crazy the alcohol probably went to her brai?

brain. Not too long after she had like 2-3 glasses of champagne she started yelling and throwing things. Today was my daughter's 4th birthday and so she bought her a large cake and my mom started yelling the whole cake is for my daughter and that no one else is getting any. Then she had hit my grandfather and threw something across the room. She said if someone touches the cake she will kill them for having a piece of cake. She was yelling very loudly. And I have noticed most of the times when she drinks she gets upset afterwards and behaves like this, ie, yelling screaming, using profound language, and throwing things and sometimes she gets physical and starts to hit other family members in the house. She has gotten physical with me on many occasions when she was drinking or drunk. She would punch me in the face and tell me I can't be in the living room watching tv because she is there and she doesn't like looking at me and she tells me to get out of the living room or she will kill me. Then when I stay she picks up a broom and starts hitting me with the broom telling me to get out or she will keep hitting me with the broom if I don't leave. Then I leave and come back on purpose and she picks up the broom carrying it around with her and chasing me threatning to hit me with the broom if I come in the living room. she would follow me everywhere with the broom when i come into the living room and threatens to hit me with it if I come out. I have noticed this only happens when she is drinking when she's sober she doesn't act this way could it be the alcohol is making her act this way maybe its kicking her brain in is my mom an alcoholic does she need help?