She's your device's wallpaper model, and she wants to be the star of your screen!
She sends pictures to your device's background, and they constantly update as often as you choose -- you can change the time between pictures in the RedShoes Settings activity.
It's free, and there are no ads.
NOTE: If you can't install RedShoes because it doesn't show up in your list of live wallpapers then check your app-drawer for a RedShoes icon that says "Installer" and touch it. That should start the install process for you.