About 3 months ago, I brought home 4 fancy silkies from a professional breeder that I drove over an hour to get. I immediately saw one acting like yours, but add that she'd also shake her head. I've raised my own silkies for several years and even use medicated starter normally, but ran out, so these ones got regular Kalmbach's starter. I, too, gave Nutra Drench and Hydro Hen on alternate days. I contacted the breeder, who said she never saw this in any of hers and had nobody else say anything. I had also added 2 fancier ones of mine the same age, and bought a chocolate one at a poultry swap, so now there are 7 of them. I had them all in a brooder together for several weeks and could pick up and hold the other 6, but this one acted like I was killing it.
Fast forward to when they could finally go outside about two weeks ago. Suddenly, this behavior stopped. I have no idea if it's a coincidence. This chick who wouldn't let me near it, turns out to be the friendliest one of all of them now. I wish I knew what was wrong before, but as much as I tried, nothing helped.