I'm really sorry your friends pup is having to deal with this dreadful disease. Sometimes pets have lived much longer than expected, every case different. I hope she can find some useful info to help in caring for her pup. Good luck to her.....
This site has the most helpful info all in one place
DogAware.com Health: Kidney Disease in Dogs
There is a support group that is very knowledgeable but you have to register.....
K9KIDNEYS : for owners of dogs with Kidney Disease