I'm so upset with my mom, I told her she couldn't drive my car but she took it anyway. I'm going to call the police and report her.
Why didn't you want your mom to drive your car?
She drives too fast and she doesn't take care of anything. She's very disrespectful to me.
I understand why you're upset, but I don't think calling the police on her is the right thing to do. When she gets back I think you need to have a discussion with her, and let her know that she should respect your possessions.
This isn't a minor offense, I told her not to take my car and she did it anyway.
This seems like something you really have to work out with your mom. Calling the police will cause quite a mess for both of you. Talk to her and tell her how you feel, if she won't listen, then you may have to create some distance between the two of you.