How many books does Karen rose have?

If you are referring to the number of books she has written then the answer would be 13:

2003 - Don't Tell

2004 - Have You Seen Her?

2004 - I'm Watching You

2005 - Nothing to Fear

2006 - You Can't Hide

2007 - Count to Ten

2007 - Die for Me (Daniel Vartanian Series book 1)

2009 - Scream for Me (Daniel Vartanian Series book 2)

2009 - Kill for Me (Daniel Vartanian Series book 3)

2009 - I Can See You

2010 - Silent Scream

2011 - You Belong to Me

2012 - No One Left to Tell