Baby chick problem help!

[silkiechickens8]

This chick (black Sumatra) has been breathing heavy for a few days now. She's a week old and is eating very good but I have not seen her drink by herself (I make her drink water). She breathes heavy with her beak closed. Is there something wrong with her? I don't think she's cold because none of the other ones are? Does she have coccidiosis? God, I'm petrified that that's what it is. That happened to me before. She's running around with the other ones so fingers crossed. Also,I have a New Jersey Giant chick that is itching her neck like crazy! Any suggestions? Thanks!