I think she need required supplements.
http://community.horse.com/thread/38323.aspx?ContentTypeID=1
You could send off to that place in KY and see what her genetics say. I think you send them a hair sample or something like that. It's not very much.
http://community.horse.com/thread/33624.aspx?ContentTypeID=1
The two-year-old Tennessee Walking Horse filly I'm training has a strange color. As a foal she looked like a dark dun, but last summer she was the color of a liver chestnut. However when I went t...