Motor mount broke

I have the car listed above that is front wheel drive and a 5-speed. My motor mount on the front left broke (the one for torque). Or it was about to fall apart because the rubber had worn down. My mom is trying to kick me out because she thinks I am lying because the mechanic told her that it was from spinning the tires and holding up the e brake and burning them and I haven't been doing any of that. So I was wondering what might be some other reasons that this could have broken since she wont believe me. Any help would be greatly appreciated. Thanks for your time!