Article continues below advertisementSavannah Guthrie believes her missing mother, Nancy Guthrie, is still alive more than one week after her disappearance."I wanted to come on and just share a few thoughts as we enter into another week of this nightmare," Savannah, 54, expressed in a heartbreaking video posted via Instagram on Monday, February 9, as she pleaded for the public's help.Article continues below advertisementSavannah Guthries Believes Mom Nancy Guthrie Is Still AliveSource: @savananhguthrie/InstagramSavannah Guthrie issued a new update on her mother's disappearance on February 9.