The biggest worry is that birds are really good at concealing any illness or problem they may have. In the wild, if they look sick, they're as good as food. Predators will get them. So, if you see a bird that actually looks sick, it'll be almost too late.
*sigh* She can't keep losing weight forever. She has to have hit the bottom now. Hmm... that's what my Financial Advisor keeps telling me about the market too. =P It's the long weekend, if we're here, she will eat. We should see some gain over this weekend.