Demi Lovato's friend did her best to share as little information as posisble with the emergency dispatcher she spoke with after the singer's overdose. A tape of the 911 call obtained by TMZ reveals that the inidentified female had asked that the ambulance rushing to the scene not use a siren and stonewalled when asked questions about the person who had overdosed. That female also stayed remarkably calm and unaffected throughout the call, at one point apologizing to someone as she instructed them to put the dogs away in a room before emergency workers arrived on the scene. The singer was at a birthday party with members of her tour as DailyMail.com previously reported, with Instagram stories that have since-been deleted showing the group at Saddle Ranch in West Hollywood. Original Article: http://www.dailymail.co.uk/news/article-5996165/Demi-Lovato-heading-rehab-revealed-downed-shots-overdose.html Original Video: http://www.dailymail.co.uk/video/news/video-1734378/Video-Demi-Lovatos-friend-calls-911-singers-overdose.html Daily Mail Facebook: http://facebook.com/dailymail Daily Mail IG: http://instagram.com/dailymail Daily Mail Snap: https://www.snapchat.com/discover/Daily-Mail/8392137033 Daily Mail Twitter: http://twitter.com/MailOnline Daily Mail Pinterest: http://pinterest.co.uk/dailymail Daily Mail Google+: https://plus.google.com/+DailyMail Get the free Daily Mail mobile app: http://dailymail.co.uk/mobile