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Hi, I am Dr. Peter and would like to help.
1- Does the lameness get better and then worst?
You are right to suspect this could be something else like a soft tissue (ligament, muscle or tendon) injury. In response to your question, we are not allowed to exchange information. If we were to look at diagnostics it would have to be here on the site.
I will recommend that you establish a consult with an orthopedic surgeon, besides evaluating the xray they will be able to do a hands on exam and do a thorough orthopedic examination to determine the exact cause of this lameness. In the meantime, rest her, limit her physical activity to leash walk to pee and poop. Speak to your vet about putting her on an anti inflammatory like rimadyl.
If you have additional questions I will be glad to answer them.