I know the original work is Japanese, so there was no intended real-world connotations, and yadda yadda yadda, but...the original skin tone change made sense even within that context. Like, I vastly prefer the darker shade for the character, and as a POC, I had a visceral reaction to her becoming white like the rest of her family. But considering where the story goes for the remainder of the story, it really does make more sense for her skin colour to change, as it serves to better highlight the new treatment she's receiving from others. It makes it so everyone is treating her as a person not just because she's now blessed by the Light Spirit, but because she actually looks like a "normal" person now too. Which just brings more credence to her repressed anger now reaching boiling point.
So even from a Western "whitewashing" perspective, her becoming white coinciding with her actually gaining the respect of the general public and her family, and the character's own anger at all these people only now viewing her as having human worth, is actually kind of a genius narrative turn that loses a bit of its energy if she's kept as our lovely chocolate princess. I'm fine either way with them cowing to fan demand and changing her back in the comicalization, but it really did work as a narrative device once you get past the knee-jerk angry response and I might honestly miss it.
Edit: (As for the chapter itself, her parents can go screw off. Bunch of pricks.)