Hey!
The baking soda solution works.
BUT you have to be sure your mixture is mild or it will burn the leaves and after spraying you need to wash off the excess and thoroughly drying her out or else the mildew will come back.
So either your mix was too strong or you didn't properly wash her after..
I suggest you spray her with clean water or if you want to risk it with the solution again but less baking soda, then wash her after and dry her THROUGHLY.
As for recovery of pistils, once they go brown they don't come back... but they could this be okay, tip will stay brown though.
There isn't much else you can do. just treat her right, good feed, stable PH and root for the best.
Good luck and happy growing.