I'm having some trouble picturing the movements as you describe them, but in any event, the only way you can diagnose hip dysplasia is with an x-ray. Are you planning on getting her spayed? If so, you can ask the vet to do hip x-rays on her while she is under sedation, to help save you some money. Or just get her in for x-rays whenever, at one year old, you should be able to get a good idea if there is anything going wrong.
If you can't afford x-rays now, you can put her on joint supplements now. There are lots of different ones out there, and you may need to try a few before you find what works for your dog. It certainly won't hurt.
My female GSD mix was diagnosed with severe HD at about one year old (we had her x-rayed). She had a total hip replacement done, and now two years later you would hardly know she had any joint problems. She is on a couple different joint supplements, and we try to keep her lean and limit the amount of jumping she does. Other than that, she is unrestricted in the things she can do. HD is by no means a death sentence, it is a manageable condition and there is no reason why your dog can't live a happy and comfortable life with it.
Get those x-rays, and feel free to PM me with any questions you might have.
Niko: American Showline GSD 5 years old
Rosa: American Muppet Dog (GSD/Border Collie mix) 5 years old