Im so sorry that Hollie is sick with kennel cough. I will have her on my prayers to get well soon. My Gucci has never had kennel cough, so I really don;t have any experience.
You can read the following info I found on Kennel cough.
http://www.vetinfo.com/dkcough.html http://www.marvistavet.com/html/body_kennel_cough.html