She'd probably do better with the flock, I didn't separate mine. Just kept her in a pen. For awhile I fed my girl a wet mash with 1 raw egg, & a Vitamin B2 capsule mixed in.
But I also did direct doses about 3 times a day.
I used Capsules.
It is impossible to overdose, so why recommend a lower dose then? Excess is excreted through urates, & poop so there's no danger.
It's pure Riboflavin I used, not B Complex vitamins.
Sounds like Curled Toe Paralysis, which is Vitamin B2 Deficiency.
It takes several weeks, to maybe a month or so to fully cure. I've treated 2 Silkies with it.