C. Oprah Winfrey is a cross of C. Kittiwake x C. Prism Palette. You can call it Lc. if you prefer, it was originally registered that way, but it is considered just C. now. It never was Blc.
Kittiwake and Prism Palette are both pretty typical big floofy Catt hybrids, Kittiwake usually white with colored lip, and Prism Palette typically splash petal, but both could appear in almost the full range of Catt colors, so Oprah Winfrey could too. Why (or if) Oprah Winfrey 'Inspiration' is particularly variable in color I don't know, but color balance of print photos and display monitors for digital photos probably account for more of the variability you have seen than the real color of the flowers.