To me this looks like a pH issue, as well as synthetic nute issues. MG is not a good choice for our fav ladies. It can work but it has to be under the right conditions, and pretreated before you use it. I always stay away from MG, there are so many other options out there that will give you better results and allow you to "control" your nute levels. If you are using distilled water that has sat around chances are that the pH in that water has balanced back to 7.0. You will need to bring that down in order for the plant to use any of the available nutes that it is already exposed to. if she is a foot tall then she is at a good age to take nutes, but i would go get something from the FF line or something like them for the rest of this grow.
The levels of the MG are good but again this is a synthetic chemical nute rather than something that is brewed and naturally put together. Get you something to lower the pH and test it and i think shell come around