Eye infection in both eyes?

It sounds like a case of bacterial conjunctivitis since there is pus. You probably infected the other eye by rubbing one eye and then accidentally touching the other eye or when you instilled the eye drops there was a little contamination. It is never a good idea to use old medication, especially when it wasn't prescribed for you. There are many types of red eyes and the drops she received could have been for another type of red eyes and not yours. Go see your eye doctor and get it checked out. I hope your eyes get better. Take care