Do you have a video of her?  If not, some photos of the eyes.
Is she still sneezing constantly?
Any mucous coming from the nostrils?
If she has runny eyes, you need to try to keep them cleaned out - flush with saline, remove any mucous and apply an ophthalmic ointment.
There can be many causes of the symptoms you describe - respiratory illness, molds and poor ventilation are a few.
I would try the VetRx, follow the directions in the leaflet or you can find them online.
If she has a respiratory illness, the others have already been exposed.  I would only separate her if she becomes lethargic, won't eat/drink or is being picked on.