VIDEO: Chick in trouble. Heavy breathing, white liquid poop, chirps but no sound... HELP!

[eggfooyoung]

One of my 3 week old chicks seemed totally fine this morning but now seems to be struggling. Please watch the video and tell me if you know what could be wrong. I noticed while filming that she pooped a white, watery/frothy poop that I've never seen before (she does it in the video while up on the MHP). I'm hoping there's something I can do to help her - I've already lost two chicks and my kids were devastated. This was one we got to replace the ones we lost (cross posted in emergencies)

 

[eggfooyoung]

Well, I've given Nutridench, electrolytes, and checked her crop - which seems normal. She's actively eating and drinking without my prompting at all, and she seems quite active - but it's like she has a cough now, and she's slightly worse than she was in the video. I feel like I've done all I can for her and I'm just basically going to watch her die a slow death. Makes me sad but I don't know how else to help her

 

[MissNutmeg]

Hmmmm... I am unsure right now.... Coccidiosis? Here is a link I found: http://www.the-chicken-chick.com/2014/01/5-common-problems-in-baby-chicks-with.html. Please keep me updated.