What should I do about my mom's behavior (Long story)?

So I don't drive so my mom takes me to pick up and drop off my son to preschool. Unfortunately she enjoys having this kind of control and upper hand and uses it to her advantage. She always talks about me to the teachers saying how irresponsible I am with my kid but yet she does nothing to help me with him, she doesn't watch, play, feed him, sleep or cloth him. She does the bare minimum but of course bc she gets to take him to school she feels like she does so much. I'm pretty sure the teachers also believe every word she says about me. So now she gets to be perceived as the "overworked' grandma who does everything for the child. If she was really as overworked as she says my child would be perfect and there would be nothing to complain about. I'm irresponsible bc I'm a 1st time single mom and no one taught me how to raise a child I'm doing it on my own. Not even she could get out of her ego to show me how do things. But I think I'm a good mom, not the best but I do try. I just wanna know what I should do.. I want people to know the truth about me not just what my mom wants them to believe
What should I do about my mom's behavior (Long story)?
Post Opinion