According to JVM's Facebook page, Amber's mom was going to be on the show tonight, but it's been rescheduled to tomorrow (May 4) due to a conflict.
May 4: Issues with JVM on HLN at 7PM ET
"Inside a parent's worst nightmare: Amber Dubois was abducted while walking to school. One year later this beautiful 14-year-old girl was found brutally raped and murdered. Now her killer is speaking out from behind bars. Tonight: I’ll talk one-on-one with Amber's angry, devastated mother! Could it have been avoided?"
http://www.facebook.com/JaneVelezMitchellHLN