The devil fruit she ate is called the

Kōjō Kōjō No Mi

It is a special type Logia, and you might ask what a special type logia is, It is basically a Logia that has forms, the forms are going to be revealed throughout the story and I made this story over a year ago on another site and I am not a native English speaker, I use google translate for some of these chapters or have a friend do rough translations of what I do.