I dont actually know anything about fermented feed but I assume that would work even better. I just make a mash with chick starter and water because its easiest. I think the point is just something more appealing than pellets.
I would suggest you separate her with her own food and water, in case it's a pecking order thing, and try to get her to eat and drink. If she wont drink freely, dribble some on her beak and see if she'll take it that way. If she is drinking freely, I would offer her scrambled eggs and wet food...
I havent read your first post yet but I want to give you a :thumbsup:thumbsup giant two thumbs up for reading the sticky tag and answering all the questions. I know it feels like a lot but itll get you better informed answers so much faster! You're great!