Yea with 4 weeks left it would be a bummer for anything to happen to her! Best of luck in your growing!! Check out that product I mentioned, it really does work. And they have an organic plant enhancer.
You would have to get rid of the bad soil and replace it with new soil. But you have to get rid of the problem so it doesn't keep coming back. I use this product called Eliminator by Holi Moli. It really helps with mold and spider mites.