I posted some ideas for you on another thread. I think I forgot your age--13--I have a 13 year old daughter at home, so maybe the suggestions that I gave you might be a little "out there".
Let me know if you need a more simplified approach. Also, if you don't cook but your mom is cooking meals, then it may be as simple as using the plate method, based on what she is cooking up. Of course, you will need more veggies and less grains and starchy carbs. But, it can work out and your mom doesn't have to stress out over it.