[Steve Allday]

It very well could be a build up of scar tissue. You could have scarring of the extensor tendon and this can create what they call string halt. There may not be a whole lot you can do about it. If you’re really interested in the diagnostics you should get a veterinarian to do a physical examination to determine what it is or if it’s something that she can live with or if it’s going to get worse or not.