US Today show host Savannah Guthrie says her family is now offering a $US1 million ($1.42 million) reward for information leading to the recovery of her mother, Nancy Guthrie, who went missing from her Arizona home more than three weeks ago.Savannah Guthrie said on Tuesday (early Wednesday AEDT) that her family was still holding out for a miracle and hoped her mother would be found alive, but she also acknowledged they realised it might be too late.