My fiddle leaf fig plant has been in our home for 9 months.  She is about 6 feet tall and receives 3 cups of water every week.  She lives in a north window – a bank of windows with good light.  She came with a few brown spots, but it seems like more have come.  Also, there is a white mildew on several of her leaves.

A friend got one at the same time, same place, and hers is also in a north window with good light.  Hers is thriving!!  She does not fertilize – nor do I.

What should I do???

Thanks –