Join Date: May 2009
Location: Winnipeg, Manitoba, Canada
I don't believe classic roan works like that - they are born roan or shed their foal coat to an even roan. The shade can change from season to season but unlike grey and varnish roan, it doesn't actually ever change pattern or color throughout the horses life. And I've never really seen varnish roan act like that either.
Quite honestly, it almost looks like an environmental factor to me. Have you examined her for any sort of skin issues or fungal issue? There's a pattern known as lacing which often is actually cause by rainrot or similar fungal infection.
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