Directly from the AKC Border Collie breed standard:

"The Border Collie appears in many colors, with various combinations of patterns and markings. The most common color is black with or without the traditional white blaze, collar, stockings and tail tip, with or without tan points. However, a variety of primary body colors is permissible. The sole exception being all white. Solid color, bi-color, tri-color, merle and sable dogs are judged equally with dogs having traditional markings. Color and markings are always secondary to physical evaluation and gait. "

Even if they aren't supposed to be Red/White, it doesn't matter as long as you're not planning on showing her in conformation. It doesn't matter what they look like for them to compete in Obedience, Agility, Tracking, etc.