see how her leaf tips are already yellowed up... its the MG soil bro. If I were you.. I would not use MG soil. Looks like your girl there is a little burnt. All cannabis plants will gradually yellow up the further they get into flowering. However with yours only being 4 or 5 weeks into flowering (which you should know exactly how old she is.. IMO.) she's a little young to have that amount of yellowing on her leaf tips. But that's just my opinion..
Just trying to help educate.. not hate.
peace.. and best of luck with that MG crap. Good luck flushing it out too...
Oh, you did switch... alright. My bad man.. I'll blame that on the current bud I'm smoking.
Glad you switched and got that MG outa there! peace..