It appears that she's clearly a sabino with a varied family tree.
That's what I thought, but I wasn't going to say it coz I'm no paint horse expert. The "knife point" stockings and large face blaze was what did it for me.
What's a sabino? I'm looking it up now but I haven't found anything yet
Oh, and the "milky chin" too, that was on the list of sabino traits.