Bradly, I am sorry that you are having this problem with Iggy. In response to your question, in any case of a front limb lameness, we need to rule out a soft tissue (muscle, tendon or ligament) injury, a fracture, joint disorders, or a pinched nerve, etc. Unfortunately, on history alone without a hands-on examination, it will not be possible for me to pinpoint the source of the lameness, I am sorry. I am going to make some recommendations if no improvement within 1-2 days the next step would be an orthopedic examination with your family veterinarian. This si what you can try:
1- Buffered Aspirin 325mg 1/4 (one-quarter) of a tablet every 12 hours for 5 days. You can buy buffered aspirin over the counter in any pharmacy.
2- Rest her, no running or jumping. Activity should be limited to urinate and defecate on a leash.
3- If no improvement after doing the above in 1-2 days I would have her checked by your family veterinarian for an orthopedic examination. If cost is a concerned look into your local ASPCA or Shelter where they often offer veterinary services at a lower cost.
My goal is to provide you with excellent service - I hope I've provided the information you were seeking, if you feel you have received anything less, please reply back as I am happy to address follow-up questions. Kindly rate me when you are done.