What we need is a whole lot of info. /wink Here we go:
What she's being fed - exactly. (Example: laying pellets, laying crumbles, any supplements, any grains and what type they are, etc)
How and where she's being kept (In a pen, In a pen with a run, in a barn, free range, etc)
What her poops look like exactly (solid with urates on top, runny brown pudding, green diarrhea, green frothy diarrhea, white and clear diarrhea, orange/rusty/brown loose)
Is she being kept with other birds? Have any recently been introduced?
Are you on city water or well water?
Is there any access to ponds/puddles/ditches?
Is she showing any difficulty breathing?
Have you checked her skin throughly, especially around the vent area, for any nearly-microscopic parasites like mites, lice?
Has she been bullied?
When was the last time she was wormed, and with what?
The first thing you need to do is make sure she keeps nourished and hydrated. I wouldn't change her basic diet at this point until you hear from us: changes in diet stress a bird, and she's already stressed with something.
What you can do is add electrolytes/vitamins to her water if you want. You could alternately add pedialyte or a bit of gatorade to her water IF she'll still drink it with that in it. If she's eating, make sure that the food continues to leave the crop. Any time a bird is anything other than 100%, I do make the change of removing any solid foods from their diet and leaving only the easily digested food (in other words take away grains and greens, continue with pellets, possibly pellets ground to a crumble, and in a very ill bird crumbles that are wetted with water).
Bird's digestive systems depend on two things: grits to break down what they can't mechanically (as they don't have teeth nor do they have an acidic stomach), and bacteria to break down what the gizzard didn't break down. In an ill bird, the bacteria are nearly always effected and thus the whole digestive process slows down. So stressed birds are more likely to get backed up crops. That's why I only give foods that break down into small particles in water - they're more likely to move through the system and get absorbed.
This is a starter set of questions. Answer these, and we can hopefully answer yours.
