I have a broken understanding about this since my knowledge of it was just stumbling across it when researching something else. I don't know about Catholics who practice folk magic, but I know a little about a sect of Christians that practice Hoodoo, which she probably hates. Hoodoo is similar to Vodou (Voodoo is the Americanized spelling) in that it's a type of folk magic that was started by black people. Haitians started Vodou, Hoodoo was started by African slaves. How the fuck a sect of Christians started using it, I have no fucking clue.
In the Tumblr magick circles, it's pretty clear they believe no one should practice Vodou unless they're black. Because DAS RACIST. I haven't heard anything about Hoodoo though.