Post pictures of the ingredients of all those.The Sav-a-Chick does list B vitamins, but we also picked up Rooster Boost Poultry Cell and Nutridrench this morning, if one of those is superior for this situation. Is it a problem if the whole brood has some? She's stimulated to eat by the others (chicken FOMO).
It's a really good idea. I have a jug of room temp water for ratio-ing supplements into, and I can use that water to make the mash!
Generally these things are safe for everyone but I don’t know the ingredients specifically.
I mentioned the Sav-a-Chick because it is formulated to give to all chicks.