Doberman Rapid Growth Problem?

Question
I have a 13 week old doberman at 10 weeks she started walking on tip toes and falling on to her knees and she kept her front legs out straight and stiff.  at 12 weeks one shoulder is higher than the other.  We asked the breeder who said that her brother had something similar and they gave him calcium tables with Vit D and that he was fine now.  Our Vet referred us to a specialist who x-ray'd and said that there was no bone deformity and to take her off of puppy food (she was on Burns) and to put her on an adult food we have her on Royal Canin Adult now.  He also said to get her to walk in long grass to build up her muscles.  It has been a week now and no change there is no history in either her mum or dads side I am in touch with both owners.  I am convinced that she should be getting a calcium supplement can you give us any advice, I am considering getting a 2nd opinion as it seems that anyone else experiencing this problem put their dog on calcium, Vit D and the problem improved dramatically.  We have always strived to feed her the best choosing, organic or natural foods complimenting this with home cooked meats and vegetables, she also has fruit she loves apples and broccoli and carrots are her favourite.  

Any advice would be great.
Thanks

Answer
You are absolutely correct. Get her on a large breed puppy food or a food that is 23 percent protein or less. Get her on calcium supplements and bone meal, as well as 1000 mgs of vitamin C per day in two doses. vitamin E, dose per weight, chondroiten and glucosamine,omega fish oils, flax seed oil, vitamin B complex. She will improve as you said, dramatically> Watch her exercise, she needs moderate amounts of exercise., not too much crate time and no jumping or flat out hard running for long periods. Sadly enough most vets don't know enough about nutrition to realize a deficit when they see it. Biotin is another great supplement.
Do it soon! And good for YOU for doing your own research and striving to do what is best for your dog regardless
good luck
Cindi