This is one of these things like assisting hatches. I do it, think I’m crazy & sometimes it works but (for me) mostly, it doesn’t. The silkies & polish are domed skull breeds and sometimes this just happens. I’ve lost 3 and it stinks. Do make sure you feed non medicated chick starter to it bc I’ve read the medicated can impede vitamin absorption in silkies & polish. I’m sorry. It stinks, and ultimately, I’ve found wry neck is pretty hard to fix.The poultry cell has some selenium in it.
You could also get selenium for humans and crush a pill and mix a very small amount of the crushed pill into a little of the nutridrench. You'd want to give her very very little of the selenium though as selenium is easier to overdose on than the other vitamins. I give my older babies around 25-50 mcg which is about an 1/8th - 1/4th of a 200 mcg pill. With her being so little I'd give less than that though.
What she is doing definitely sounds like it could be wry neck to me.