You're close, but no cigar. In most pictures her hair has a slight tinge of purple, sometimes pink, sometimes orange, sometimes pure white. I would guess her hair is just a silverish color (like the ones you posted) and her hair "changes" with the scenery around her to help make her hair look less 2D. But like I mentioned, most of the time, there's a tinge of purple in there. I would say her hair is made up of some variation of Lavender Blush, Thistle Purple, Lavender Mist, and White.
Remember it's an "anime" type of character, so the chances of finding her exact hair color is going to be iffy/hard to pinpoint.
"He who fights and runs away, lives to fight another day!"