yeah dude, have you ever smoked bud grown with miracle grow? its really not bad at all. if you follow protocol, the nuggets turn out just fine. Dont listen to what anybody has to say about MG being shit. You just have to be careful not to burn your plants when adding outside nutrients. theres nothing wrong with miracle grow at all.
Your mother clone looked like it had SEVERE mag def. I had a flowering plant look EXACTLY like that, and it got to the point to where icouldnt figure out what was wrong with her until it was too late, so i had to kill her off, but i was able to save her sister, who had the same disease, but it wasnt as progressed as the other. Now, im just telling you what it LOOKS like to me, but that may not be the case in your situation. Although, the plants that i had problems with were grown in miracle grow aswell, so then again, it may be the same thing. The simple solution (and it works rather quickly) would be to dissolve some epsoms salt in a spray bottle and foliar feed your plant a couple times a day. within 2-3 days you will see improvement in your girl, and although the damaged leaves wont recover, all your new growth will go back to growing as usual. If its NOT mag def, then no harm done, other than the harm thats already been done of course, lol.
Hope that would have helped, but like i said, im only going by my own experiences, and in no way am i claiming im an expert at all