Who is Zoey Redbird from Marked: A House of Night Novel and what is their importance?

Zoey Montgomery is a 16 year old girl that attends Broken Arrow's South Intermediate High School. Zoey has an almost relationship with football star Heath and is best friends with the fast talking and rarely silent Kayla. Things change for Zoey when she is Marked by a Vampyre Tracker at school. This means that Zoey is going to become a vampyre. Suddenly, Zoey's entire world changes.