I'd also just call her a bay sabino. Sabino will cause the large roany patches, along with the ashy coloring of her mane and tail.
I'd venture a guess that one of her grandparents was a Clyde. She's got just enough of a drafty appearance to indicate the presence of draft blood, but she's small enough that she's probably not half.
She's a cutie, I can't wait to see how nice she looks when ya'll get some weight on her.