Police were called to the girl’s family home at around 10 pm on Friday evening.
Emergency services attended the scene and Chloe was taken by ambulance to Dumfries and Galloway Royal Infirmary where she was pronounced dead a short while later.
A post mortem examination will be carried out in due course to establish the cause of death however there are not believed to be any suspicious circumstances.
Following the news twin Chloe’s Facebook page has been flooded with over 100 tributes.
One friend wrote: “There are no words to describe how heartbroken I am Chlo. I’m going to miss you so much. I love you.”
Another added: “My thoughts are with your sister and family. I cannot believe what’s happened.I will miss you Chloe, so young and beautiful. Love you hunny and hope you’re at peace.”