For this reason, if she is not walking on the leg at all, or only placing it now and then, I really would get her to your local Vet clinic as soon as possible and they can assess whether there is adequate blood getting to the leg and rule out systemic shock. Here the Vet will undertake a close examination of the forelimb and may even wish to x-ray the leg (which would be the ideal) in order to rule in or rule out a break.
If a fracture of any sort is ruled out and the blood supply to the limb appears fine, your Vet may then wish to send your girl home with antiinflammatory medication for a week or so to help numb the pain and reduce inflammation in the leg. If this is a fracture, obviously your girl will need a bit more work either at your Vet's or at a referral Veterinary surgery.
Best of luck with your girl and please do get her to your Vet as soon as you can if seems sore or if the paw is still very cold. Please reply if you need more advice won't you.
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Dr M D Edwards