Mom is toxic af

I go to work and take care of my kid. My cousin had a bday party but instead of going I picked up hours at work. My mom is the manager and was ok with it, but I didn’t show up when she wanted me to I showed up later on at the original time I was needed and she basically told me I don’t care about my kid and that I don’t do anything for her....and this is literally what she says to me all the time and I’m sick of her putting me down.