If you give foods other than feed you need to make sure you have the correct size grit available at all times. Hay or long strands of grass will quickly get bound into a mass and get stuck in the crop.
You have to get the olive oil in the chick...then massage and massage and massage some more.... to break up the hard mass stuck in her crop, this can kill her so act quickly. you also need to make sure she doesn't dehydrate as well. give water with a little sugar or save a chick for energy.. If this last for a few days. you will need to give soft runny foods...things that can just slide thru so she has nutrients to keep her strength.
[FONT=Verdana, Arial, Helvetica, sans-serif]Sour Crop or Impacted[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]Is more hard or like a water balloon? Sour crop will be like a water balloon; whereas, an impacted crop is hard. "Doughy" kinda sounds normal, but that is a vague enough term that it can encompass the whole range of possible problems. Is her crop still full in the morning when she awakes?[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]If sour crop:[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]Massaging the crop in a downward motion. Hold all food from her and give her water with some apple cider vinegar (ACV) added to it (preferably ACV with mother, but regular will do). Make sure it is in plastic or glass as ACV corrodes metal and this can be toxic. A few times a day (as available anyway), give her an irrigation syringe full of 1/2 ACV - 1/2 water. This will take some patience as you can only give a little bit at a time to ensure she doesn't choke on it. I had a hen with sour crop that I would massage her crop while giving her the syringe. It would gurgle something nasty and she would have gnarly burps, but she started pushing up against my hand to keep massaging her crop and would open her beak for more of the ACV mixture, so it must've felt better. Sour crop is a yeast infection in the crop (hence hold food so it doesn't ferment more in there). The ACV kills the yeast. After a couple days you should see a difference and after 4 or so days, she should be near normal. Sour crop kills, so act quickly.[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]If an impacted crop:[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]With Hold food. Give olive oil soaked bread (the bread is just to get the olive oil into the bird). Oil seems to be the best remedy as it slicks up the passage way to allow for food to pass through. It gets tougher it is long grass/hay stuck.[/FONT]