I mean, she already was a bird, or at least a modified version of an animal that shares an ancestor with modern birds.

(Blue has in fact seen raptors with feathers before, but the avian dinosaurs that are also called raptors, such as hawks and eagles,
are strange enough to her that they don't match her definition of raptor any more than she matches theirs.)

The real Velociraptor, Deinonychus, and Dakotaraptor, whichever of those the Jurassic Park/World raptors would best match,
did unquestionably have feathers back in the Mesozoic Era. I figure that’s true in the universe of this franchise, too,
even if some part of the cloning and genome gap-filling process resulted in these "Velociraptors" created from their DNA
being covered in scales instead with just the occasional bare quill.

An already scaly animal changing its scales into feathers is not a thing, as far as I know. An animal growing scales in some
parts of its body and feathers in others, however, is. The bumps on Blue's head look like something that might have developed
into feather follicles, even though on her they didn't, and obviously the original dromaeosaurid would have had a lot more feathers
on most of its body. I guess we'll see whether or not the fluffifying will stop at this for Skye. I've never drawn her in a style detailed enough
to have to decide exactly how much of her, besides face, feet, and fingers, is scaly, and how much is just skin waiting to grow plumage,
even if it's taking longer than it probably would on an animal created by natural evolution rather than meddling human curiosity.