Mini update. The wing feathers look kind of light blue with brownish tips. What do yall think?
I found a photo of the flock the chick's parents came from. They had another photo of paints, which I assume is where my rooster got his white. I don't know how outdated these photos were when I got them because the owner didn't mention having any cuckoos at the time, yet I hatched 2 cuckoos from her eggs.
Anyway, this photo caught my eye. I think the chick might look similar to these blues with brown. I don't know if they would be considered blue partridge or not. That would explain the brownish tips of the chick's feathers.
I must have missed your post yesterday, but I agree, most likely she'll look similar to that. It's hard to say what she would be considered color-wise, especially since she's a mix of varieties and Silkie varieties are already a bit tough to ID because of the silkied feathering, but I would probably refer to her as Blue with leakage if she were my chick as she's clearly not pure for partridge based on her chick down.