This girly has an absolutely enormous crop which is squishy, not firm. Bout the size of a grapefruit (she's 2.5kg so a big girl already). There is also an unpleasant smell if I sniff her beak, so I'm assuming I'm dealing with sour crop. She looked normal before today, but has been slightly off the past couple of days - nothing huge, I've seen her still and a little hunched a couple of times but no change in appetite. Currently I've popped her in my hospital cage to stop her putting more in there, as she was still happily foraging away. I've been putting ACV in their water, once a week a t5ml/litre but I've just learned that this is not enough so will be upping that, and they have grit. Everyone else is fine. What else do I need to do to help Prannet recover?