For giggles, check the feed and make sure there's no lumps in that. Here right now it is so humid, the feed is molding right in the bags! I just had to throw out 2 1/2 full bags because of mold starting. I just opened these 2 days ago. She could also have had an egg that didn't form right. I can't remember what they are called, but essentially, the shell stays liquid and comes out that way. I've seen it a couple of times in my older girls but once I had someone else tell me what it was I never bothered researching it. Sorry. Something you could try if this does come back..use the recipe above for the water and vinegar and just gently squirt it into her vent. Then as I said give her a probiotic.