I don’t think White’s problem is “her brain got broken by the Corruption beam” so much as, well…
Have you ever met someone who has a very particular idea of the way things ought to be, to the point where they basically ignore and override anything that counteracts their worldview? And they do this with people who don’t agree with their worldview, particularly people they’re responsible for and have control over, like their children or younger relatives, and they constantly interrupt and steamroll over anything their kids do that indicates they’re an individual outside of that person’s control?
White’s kind of like that. Except she’s omnipotent. And she may or may not have the power to reach inside people’s heads and remove pieces of their minds to make them perfectly obedient. And that’s absolutely terrifying.
That happy welcoming party set off some warning bells. It doesn’t seem like she’s necessarily forgiving “Pink” so much as trying to put her back under her control. She separated Steven from everyone else and then shoved him into a room.
I imagine she’s not going to be so nice when “Pink” refuses to play along, especially if she insists on being called “Steven” or trying to return to Earth. There’s a reason why Blue and Yellow are so afraid of her. They’ve seen this before.