Mephisto Grow

It's always possible. I'm not seeing you report on the pH here... if the pH is not in the right range, that would definitely cause a lockout no matter what nutes you were/are giving - you could throw a whole bottle of calmag at her and if the pH isn't right, she wouldn't be able to get at it... Make sure whatever you give her (water or nutes) is pH'd to 6.0-6.2 with 6.2 being the ideal "sweet spot" for a soil grow. And just another word of caution - get that humidity down into the 50s or even 40s... you'll run the risk of a fungus issue if you don't. 60s is great for seedlings or early veg but not for flower.... Good luck!