Originally Posted by smrobs
Yes, it is entirely possible that she is maximally expressing the LP gene then and would be considered "white" not gray.
Gray horses have black skin regardless of their actual hair color.
If she is only half Appy, she couldn't be maximally expressing LP/PATN white, as that would require homozygosity for the face to be pure white.
To the OP - how about a full body shot? Interesting horse, as the black spotting of the skin there is not typical of normal Appy mottling - it caqn happen, but it's just not typical.
My gut tells me she is both LP and grey, but can't say for sure...