Until you can get another chick, you'll need to help this one feel less alone. People have said feather dusters or stuffed animals can help the chick feel less alone.
I did raise one lone chick, but I kept her with me constantly, as in under my shirt as I read on the couch, and on my lap driving for curbside pickup of groceries. At night, I made sure her brooder was in a dark place, and I didn't let light in until the morning when I was up and ready to be a chicken mom again. She got a friend when she was about 4 weeks old, and they still managed to become friendly with each other.
You can try electrolytes for yours now to help combat stress, but the best thing for her is a friend.
What is your setup like? Chicks can die from shipping stress, but the brooder is also important. What feed do you have, and which waterer? Does the chick have a cooler place to go in the brooder?