What others have said. Plus, if you can get a chestnut from her, or another horse and place it in your pocket it can help. This way you smell like a horse, and she won't be quite so afraid. She will be curious too.
Chestnut: The nobs that are on their legs on the inside around the knees. They peel off from time to time. They are sent areas, horses ID each other by their smell. :)