Speaking of drawing out infection- have you considered using ichthammol on it? If there was ever an instance where drawing salve would be recommended, I would say this is it. I am pretty sure that there is some sort of infection in the toe. Where it started is the question. I am thinking...
Is there a wound on the far right side of that toe just out of view of the camera? Or is it just dirt?
It certainly looks like she has something going on. Without the tell-tale black scab it's hard to say. Is she limping?