Mark, I'm just seeing this thread, now. I am so sorry that Sally is going through this, but it's good that they were at least able to save her foot.
As I have been reading through this thread, I've been struck by the similarities to what my ekkie girl Maya has been going through. Here's a link to the thread:
http://www.parrotforums.com/eclectus/61889-okay-let-s-talk-abv-pdd-toe-tapping.html.
Long story short, Maya presented with non-diet related toe-tap as well as a nerve sensation that was causing her to gnaw at her feet. We caught it before the gnawing got too bad, but they were really raw.
The vet explained that there was a relatively new theory that toe-tap wasn't always diet-related. That sometimes it was the neurological effect of an illness attacking the peripheral nervous system. This illness is related to PDD, but instead of attacking the proventriculus and other parts of the autonomic nervous system, it attacks the aforementioned peripheral nervous system.
I mention this because, while toe-tapping is specific to ekkies, this illness is not. And here's the kicker. This particular relative of PDD has flare-ups that are triggered by stressors such as infections or severe hormonal spikes. In Maya's case, it was infection. And when these flare-ups hit, they are treated with an antibiotic to take care of the underlying infection (or hormone therapy for hormonal stress), anti-inflammatory medication to take care of the inflammation in the legs, and a nerve medication to suppress the tingling in the feet.
Sounds enough like what you're going through with Sally to merit a talk with your vet, I'd think.
Since treating Maya, her symptoms have disappeared. But if ever she gets another infection, I know to be on the lookout for another flare-up.
