Just sleepy or something wrong?

Hello! This is my first time raising chicks. This breed is a Sicilian buttercup, I’ve had her for 6 days. She had pasty butt when I first got her but I got that cleaned up and her vent area looks just about the same as all the others (just a little left over poo that I will re-soak).
She hasn’t seemed too lethargic before but I’m still getting to know all of them. Today I am sitting outside with them for the first time and notice that she seems to be very sleepy, and her wings are lowered. She seems alert enough until she starts to fall asleep and then quickly wakes herself up again (like a toddler does when they don’t wanna fall asleep)
I worry she’s sick or something. Is she just tired? What can I do?