So we treated for cocci per Ron's instructions (thanks again!) and Alice seems the same. Still very docile, puffed up and pale. She plays treat-football and explores the garden, and she'll practice flying and crowd in to be picked up to go outside. Here are some pictures of her and her sister (and brother):

Alice

Alice in the middle

Alice on the right

Alice in front
There are a few more pictures here: https://www.backyardchickens.com/t/761436/puffed-up-pale-chick-treated-for-cocci
What's the next step? Is there any chance this is just how she is? She's such a sweetheart, I really want to make sure I'm doing everything I can for her. Should we treat for worms? They're five weeks old. Hope everyone had a great Easter!
Alice
Alice in the middle
Alice on the right
Alice in front
There are a few more pictures here: https://www.backyardchickens.com/t/761436/puffed-up-pale-chick-treated-for-cocci
What's the next step? Is there any chance this is just how she is? She's such a sweetheart, I really want to make sure I'm doing everything I can for her. Should we treat for worms? They're five weeks old. Hope everyone had a great Easter!