I'd be very willing to bet that she is a white chick out of a white/paint breeding somewhere down the line. I have hatched a few chicks from a white to paint or white to white/paint pairing and have had chicks with any combination on lighter skin, pinker combs, stray dark feathers, and lighter eyes or eyes with light blotches. It's the paint genetics throwing its weight around. That'd be my guess, anyhow. Will she throw it on to her chicks? Probably, but presumably it would get weaker with each generation, and you'd probably hatch some good-colored birds along the way, too.