I went to visit your diary, and I really like your setup, with the drip and tray to collect runoff!!
What I see is your feeding seems perfect and it looks like you know what you are doing..
But what I also see from week 2 picture, is you might have transplant her in dry coco? Coco should stay moist all the time, as it dries it changes the pH. Also I can only guess you've correctly rinsed and buffered your coco, but otherwise coco is very salty and this is affecting cation exchange.