>>70321686She hired a Japanese dancer to wear a special suit with tracking devices that record the movement of the dance in a computer program. The computer program then renders a 3d model of Ironmouse's choosing and the software connects specific points in the model to specific sensors on the dancer's suit. The program can then have the 3d model move in the same pattern as the dancer.
You may be familiar with this technology utilized in popular superhero franchise movies like the Marvel Cinematic Universe or James Cameron's Avatar.