Thoughts?

My mom gets angry when I don't let her use my car (I'm 21 years old, not even living at her house). She got angry because I didn't wake up at 6AM to take my brother (who does not have his license), to work. I take care of my 6 month old son and barely get sleep as it is. In the morning after I woke up, she made sure to tell me that I'm not a good person and how I'm rude to my brother (which isn't true lol) and how they should be able to rely on me. Lol. I feel like I shouldn't have to listen to her and I feel like she shouldn't have control over me and make me feel bad about something that isn't even my fault. What are your thoughts? She still (hours later) won't talk to me lmao 
Edit: she is an extremely weird person. She makes everyone feel bad about everything always and actually acts like she hates everyone including me. She is an extreme narsassist.