Jen - Sorry you and your daughter are going through this. I know it must be torturous to watch her suffer like that. It is possible for children her age to experience anxiety and I would like to recommend that you get her to a child psychologist or other mental health professional who specializes in working with children as soon as possible. It will be best for her in the long term to get this addressed as soon as you can so that the anxiety does not generalize to other situations/settings.
Rick Wirtz