Thank you for reply , others on a genetics page on Facebook have all said shes Champagne
From Wikipedia https://en.wikipedia.org/wiki/Champagne_gene :
"Buckskin and Bay dun vs. Amber champagne: All three of these genetically distinct coat colors feature a lighter bronze or tan coat with darker points. As adults, the pinkish freckled skin and hazel eyes indicate amber champagne, while gray or black skin and light or dark brown eyes indicate buckskin or bay dun. Duns do not exhibit unusually colored skin, though buckskins, like palominos, may be born with blue eyes that darken within days or weeks.[27] In the adult, the points of a buckskin or bay dun will be black, not chocolate as in the amber champagne.[28] Bay dun horses also exhibit primitive markings, especially a dorsal stripe, though amber duns will also possess these marks. The eyes and skin remain the best identifying feature. Buckskins, like palominos, will a parent that is palomino, buckskin, smoky black, or blue-eyed cream. Bay duns will have a parent that is bay dun, red dun, or grullo. Champagnes will have a champagne parent."
From that description I think she could be champagne, mostly because her lower legs aren't very dark and her skin pinkish.