Had a report on Tiggy and it sounds like she is responding to treatment for a sour crop.
Don't know specifically how they have been treating Tiggy but this I think is the usual process. Sour crop in raptors is considered an emergency medical condition. Sour crop occurs when food is retained in the crop and starts to decompose which causes bacteria to rapidly proliferate which if not treated promptly can lead to septicemia and death. Treatment involves removing the food (carefully), then the bacterial load needs to be decreased and then the birds needs to observed for a few days to ensure it doesn't happen again or that the sour crop was caused by some other cause.
I don't know how bad Tiggy's condition was when she was brought in or how she got sour crop, though over feeding apparently can be a cause which makes me wonder if she told a little trip and then came back and ate too much too fast and it was more than she could handle. And those worried about her being dehydrated, remember the peregrines get most/all of the "water" from the food they eat and if she has problem with eating that could be the reason. But that is just guess - until her carers have more time to chat with me I won't know all the details. And we may never know all the answers but so long as she recovers that is fine.
