Okay, I Googled around a bit and found Ludivine. She comes with MAT poses. If you installed her right, you should see a "Ludivine" folder in the "Poses" section of your Library, with a MAT pose that applies the textures and MOR pose that applies the character morphs to her face.

I suspect you did not install her correctly. It won't install correctly if you unzip it to the Poser directory, as the files you DL from Rosity will. Sometimes files you DL from other sites have to be unzipped to either the Runtime or the root directory -- one level higher or lower than Rosity's standard. Move the files to the right places, and you should find Ludivine's MATs and clothing in your library.

Also, the readme file that comes with the file says that textures that comes with the character are low-res, and recommends buying $35 high-res textures from ZetaStudios. So if you saw this character in a gallery image or something, they may have been using different textures.

The image is Ludivine, with her default textures, rendered in Poser 5, with the default lighting.