sick chick Please help

I received 11 new chicks today a combination of Brahmas and Cochins all standard. They were hatched Wednesday. I came with a pasty butt, I washed it off and dried it very well. Now this evening she was panting hard and laying away from the others. I brought her in gave her Sav-a Chick with a dropper, she is now wrapped in a towel next to me under a light. Her little beak opens with each breath but she is sleeping. Her peep is very soft.

I am new to all this and don't quite know what else to do.