ouchhhh. If this is not regular, then your mother obviously snapped under pressure tonight. And it is NOT an excuse.
I’m scared for the responses you will get because i know many will say call the police for abuse, and i don’t think that’s a good idea. If this is not her normal behaviour, give her a day or two to cool off and see if she comes to apologize. If not, perhaps bring it up in a non-accusatory way, when you are calm and can stay calm. Don’t accuse, don’t use ”you”. Explain you were hurt and surprised, and see what she says. If applicable, ask your father for advice.
That’s not acceptable behaviour, even if someone is under stress though. Sending a hug…