I would do a trial run with all 4 clear and with all 4 black and see which way flatters her more, especially since you're doing halter. Sometimes some clear and some black just looks silly, sometimes it works well. Personally, I think black polished hooves with socks tend to make those legs look bigger, like the horse is wearing galoshes.
I've always just done clear polish, even on horses without a speck of chrome. I love the natural hoof color with a little gloss. Fortunately now I can actually justify clear polish on Mr. Four-socks!