Draxxin. If she dies after a dose of Draxxin, she was gonna die anyway.
I have seen critters act like that before. It might not be a respiratory infection at all, at least that might be why she wont respond to antibiotics.
More than once I have seen that and it ended up being congestive heart failure, or at times an infection of the pericardial sack.
Heck, even a virus of the pericardium can cause those symptoms.
