Cheetah injects herself with a serum to become more powerful, resulting in a slightly more bestial form. Not much in terms of process, but there's some there. Fun scene from the movie, regardless.
https://www.youtube.com/watch?v=_asUGoXMLbs
I'd love to see a proper Barbara Ann Minerva to Cheetah TF at some point. Here's hoping Wonder Woman 1984 gives us something.