Poor Thing!
I hope the vitamins do help, she may have suffered permanent damage but it's so hard to know.
Vitamin therapy can take weeks, so give them time to work, keep them going for a good while.
Welcome To BYC
I'm sorry about your chick.
Do you have photos of her?
A video of how she walks and holds her head may be helpful - upload video to YouTube and provide a link.
Wry Neck is a Neurological Symptom. Some common causes are Trauma to the head/neck, Disease like Marek's and...