BLAST that girl with light. It's an auto. The whole trick to growing auto's is to get them as BIG as possible during their VERY short veg period. Auto's need more light than regular cannabis. What is your light schedule? Auto's can handle 24 hours of light during veg, and even flower for some(better to give a couple hours dark at least). The more light the better. Auto's have a short life. One of the advantage of autos is that they grow FAST, and generally finish fast due to accelerated growth by being able to flower under 18-24 hours of light. The only thing that bothers me man is that you keep saying "they're auto's" like auto's are supposed to be small plants, lol. There are a ton of Autos out there, big and small (the ones I'm currently growing can get over 4 feet, and put off a pound per plant). So you got a little plant, it's nothing to be ashamed of dude.
I'm subbed, and can't wait to see how it turns out bro. I just would like to help you get all you can out of the plant. It's hard to help someone when they deny they have a problem. Like AA. You must first admit you have a problem and are powerless over it, lol. Then we can give suggestions like get that girl out of that shit soil ASAP. If that's not an option then try Feeding it with some Cannabis Specific Nutes. Also, plants don't always burn when you over feed. Sometimes they just get stunted which doesn't always mean that they just don't grow at all. It could also mean that they are not growing as fast as they should. You said before that the only difference between Miracle Grow Soil, and Soil specifically for cannabis is that you don't have to feed with Miracle grow for the first month. The truth is with cannabis specific soil you don't need to feed during veg either. Are you dead set on soil? If you could be persuaded to transplant that girl into a bubble bucket you will see a MASSIVE difference in growth.