One of our chickens hatched her chicks about a week ago. She has been caring for them but one of the last to hatch has pretty bad pasty butt. From what I know it is common in chicks bought from a feed store due to stress or too hot temperatures. Since the chick is being raised by her mother I'm confused as to why she has it. Yesterday evening we noticed the chick wasn't eating and was lethargic. We brought her inside and found her vent and surrounding down were completely covered. I used warm water and hygroden peroxide to soften and loosen it. I was able to completely clear the vent. This morning she wasn't keeping up with the others and saw that her vent was plugged up again. I did the same I was able to clean her up again. I used Vaseline to clear her downy feathers away from the vent. She's still pretty lethargic and won't drink unless it's with a dropper and won't eat. We are feeding all the chicks medicated crumble and water with added electrolytes. What is the best way to prevent pasty butt? How do I get the chick to eat and drink?