I wouldn't doubt that a horse that went to Congress could end up in the kill pen. We slaughter champion racehorses all the time. Tons of QH, Appy, and Paints go to slaughter too. Glad she is one of the lucky ones.
I had a horse just like this when I was younger. My family raises Ap's. I beat almost anything when she was younger she was chestnut with a large blanket and as she has gotten older she has roaned out. You can tell she was at one time chestnut becasue of the color on her legs. Usually in Ap's the legs are the last to change color. The reason I believe she had a blanket is bc if you imagine a line from her withers to her stifle area you can see an obvious difference in the coat pattern. My gelding at the age of 15 looked just like her, I will have to look for a picture!!!He also had a flaxen mane and tail that got whiter with age. He was really striking when he was born!!!
I know I pm'd you before but I couldnt get the pics from my computer on the message. Its really weird she was right next to my gelding in camelot!
ETA- that last pic is of your mare my gelding and an arab.