Her mane is not ideal to use as an indicator, since she's a pinto, I would still check her undercoat in her flank area, and see if its all white colored underneath all the bay. She's definitely got some grey hairs on her head, but so did my dad's true non fading black horse. The only "white" markings he got were a few random white hairs in the middle of his forehead. I would say though that she's probably got the grey gene, but I would still be interested in what color her undercoat is around her flank, just cause I'm interested in color genetics, and have been reading up on it, and like seeing all the different patterns and coat changes ect. Again she's a very cute little girl. What do you plan on doing with her?