I suggest being bold and confident in handling your chicks, But balance that with a good dose of kindness when you handle your birds. Just remember that you are so much bigger than they are and they can't hurt you. No matter how much Cinnamon flaps and struggles, YOU have the upper hand. Try enticing her with treats and calm behaviour whenever you interact with her. It may take some time and patience, but I think you can win her confidence.
I've "tamed" many wild animals with this technique. It works for me and perhaps it will work for you.
Good luck.