Good point, madchen. She is wearing white earrings and, if you look really closely, it looks like the collar of her dress might be white too.
Then again, her dress in Wonderland has a lot of white and pink too:
The shade of her lipstick might be a bit lighter but it’s still a similar colour all together, so perhaps instead of thinking she might’ve been good, Cora wasn’t actually a saint from the very start?
Young Cora’s look is pretty fierce!