Puffed up 7 week old

[Slovie]

My 7 week old RR is puffed up, stretching her neck to the side, yesterday she kept to herself in the coop. I don’t feel any lumps or anything out of the normal. I gave her wormer and have separated her with only water. What could be wrong?

 

[coach723]

Can you post some pictures? Or a video showing what she is doing with her neck? You have to upload a video to youtube or other host and put the link here so it can be seen.
What do her droppings look like? When you say puffed up, is she just fluffed up, or is her crop swollen? Is she eating and drinking?