I placed them in a larger brooder but changed the bedding to wood shavings. They're thinner than the shavings....I noticed our favorite girl sneeze. I watched her closet, she kept rubbing her beak in the ground. Then she'd neeze again
What is the source of the shavings? Are they purchased - what type of wood are they made of?
Rubbing the beak on the shavings and an occasional sneeze sounds like she is clearing her nares (nostrils) of debris (food/dirt, etc.) Chickens will rub the beak on things like pants legs the ground, shavings to wipe of the beak when eating/drinking. They can also get a little food in the nostril and snort/sneeze to blow it out. So consider these things before you panic
Now...it is possible that the other chicks may have had a respiratory illness that was contagious. Some illnesses can linger in the environment for several weeks - it can be in dust, dander, feathers, your clothes/shoes and live on hard surfaces for a while. For now, if she is not showing other signs of illness, I would just keep a watch and see how it goes.
http://edis.ifas.ufl.edu/ps044