That's the easy part. Here's how we do it:
We've found that an easy way to give meds is to mix them up in food. We do it this way, especially for Vitamin B-Complex (tablet form) and Vitamin E, which is a sticky gel:
Put 1/4 tablet B-Complex in a bowl and crush/pulverize it (mortar and pestle works well here). Then add about 1/2 TBSP of her Starter Feed to the dry mix and stir it up; you're trying to distribute the B-Complex before adding moisture. Next, we mix in about 1/4 TBSP of mixed-berry flavored Yogurt (any flavor will do), then puncture the 400IU gelcap and squeeze it on top of the Feed/Yogurt/B Complex mix. Mix all of that up to a moist paste, adding a little Yogurt if too dry or a little more Starter Feed if too wet.
We try to get the consistency to be like a moist dough ball, something that will stay together enough for the chicken to pick up pieces of it, but not so dry that it falls apart. Our chickens will readily eat this on their own in all but the most severe cases of Wry Neck. In those severe cases, we hand feed them, using about a two-pea size amount at a time, dropping it in their mouth while we hold it open. Feed ALL the mix at each dosing/feeding so they get ALL the Vit-E...
NOTE: you can mix fried/boiled egg yolk, seeds, whatever your birds like and find to be a treat that will help them eat. As long as they are getting nutrients and the therapy, you're on the right path.
For Wry Neck, start with feeding this twice per day; some say once per day, but we've found that for getting ahead of the curve (multiple doses) works better for us. Please continue to update us on how she's doing.