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Blood poisoning from rusty wire? Anything stuck in her paw that you missed the first time? How's the cut look, any swelling? Did the cut get any tendons or anything?
Sounds like you've done your due diligence. Sounds like some Xrays or scans of some sort are in order. Do you have pet insurance? Keep us in the loop and hope things get sorted out. Dog problems are no fun.
Several hundred dollars. If you are a client and had recent exam it will be cheaper. Dog very well could have injured itself from the panic/trauma. Not related to scar. Bad knee? Get xrays to start.
Retained foreign body? Time to see a vet.
Did you try anything like Duralactin for general inflammation?