Sunfaded brown. I don't think she is a cream dilute, and I am basing that off her foal coat, not her adult one. Her foal coat very much screams brown to me - darker than a bay foal, with the 'sooty' along the top line. No doubt in my mind that she is brown.
Edit to add: The golden cast to her coat in these pictures is being caused by the lighting not by her coat colour. They have been taken in very late afternoon sunlight, probably only an hour or so before sunset.
I'll get more pictures of her during the brighter time of the day. We are in Southern Cal where temps get up to 112 and she and her pasture buddy choose to stand out in the sun, rather than under the trees? My bay is still as bright as ever, does not get sun-faded at all.
Heck, apachiedragon and I both have breeding stock Paints, both buckskins that are "seasonally sooty". We couldn't really figure it out. When they shed out their winter coats, they have a lot of dark brown hairs mixed in, so they look filthy, but it's their hair. Really random.