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It's the W20 acting with the sabino which makes her so white :)

What you are seeing with her is the combination of Sb1 with Kit20. Kit20's effect is to enhance the amount of white on a horse. She also has Medium white factor, which increases the amount of white. She is homozygous non-sooty as well, so there's nothing darkening the color of the pigment on her.

Sabino 1 is a fairly safe gene, except when crossed with White 1, 2, and 3 with high white factor. If I were going to start a line, I would look for a stallion with Sabino 1 and Medium or higher White Factor, and start collecting mares with Sabino 1 or White 20 with higher White Factors. If I wanted paler colors like this mare's, I would concentrate on heterozygous Cream or both homozygous or heterozygous Champagne and homozygous SS (non-sooty). If I wanted a variety in the pigmented areas, any base colors and presence of Sooty would be allowed.

Not every foal will fit the desired level of pigmentation, so I would then cull any of them with more color than I was looking for and put them into my show string.

Other genes that can give similar effects would be white 1 or 2 with extensive white factor. However, since both of those break the Kit gene enough that they are almost always lethal if the foal inherits a copy from both parents, so it could be trickier to be successful than by using Sabino which is a generally safer gene, even when homozygous.