A letter written by Gemma Dowler. Missing schoolgirl Amanda Dowler's sister has begged for the safe return of Amanda to her family. Sixteen-year-old Gemma, who has been too distraught to talk publicly about her feelings, hand wrote a heart-rending letter. * in a fresh appeal to help find her sister. Amanda, who is known by friends and family as Milly, vanished nine days ago as she walked to her home in Walton-on-Thames, Surrey, from the nearby railway station.