well,since she grew up with Face,she probably is very attatched to him.She obviously loves him very much Im not really sure on how to make her more independent.Ive never really experienced anything like that.My godparents GSD's were very attatched to eachother,they would go every where together.similar to was Rita does,but only they both did it,not just one dog.
im sorry i dont know how to help you and Rita,mabye ask a behavorist?? or call an obeidiance school and ask if they know how to break it.