What's wrong with these leaves

Looking at your diary, you're not giving the right ratio of nutrients (and one important nute is missing altogether!)... Since she's just gone into flower and you're using the GH Flora Series, you need to be giving 1 part FloraGro, 2 parts FloraMicro and 3 parts FloraBloom (this one was completely absent during veg but was important... the series calls for equal amounts of all three during veg). This is also a good time to add a dose of calmag once a week - that will prevent further problems down the line. I think, if you make this switch, she'll reward you handsomely.... Good luck!