Citric acid will get rid of powdery mildew, not sure if it works for actual mould or bud rot...
Maybe
@InTheShed will stop by and clarify that, and share his recipe too...?
It's the powder they put on sour candies to make them sour, so you might be able to pick some up at the grocery store- if not,it's cheap on amazon- 4 ounces will last you for years..
Dark green leaves generally mean a bit too much nitrogen, light green leaves mean not enough nitrogen...your leaves seem to have both right now (dark edges, light centers) ....might need to watch her for a few days to see how dark (or light) she ends up...either way, it's not likely to become a problem, you may just need to feed her a little less, or a little more. (probably a little less)
I wouldn't put off her training because of it- she's doing great- her nutes just need a little fine tuning.