I haven't even logged in on Allnurses in years, much less posted on any discussion board, but I felt compelled to post a reply. First of all, I am so sorry that you and your daughter had this type of experience. I have a teenaged daughter with some troubles and I pray that she never attempts or even contemplates suicide. Admittedly this is one of my biggest fears for her. I sincerely pray and hope that you are both doing better and getting the appropriate help.
I have been an RN for nine years, and I was a paramedic for twelve years prior to being a nurse. I have never worked in the ER as an RN and I most likely never will, partly due to a lot of ER nurses' attitudes like you, the OP, described. There is a hospital in the area with a reputation for rude ER staff, and I myself have even been hesitant in the past to seek care for myself and my children, even in their urgent care area.
I have taken many, many patients to ERs in the past: dead, half dead, urgent, or for BS reasons, and I understand that a lot of that gets old after so long. I hated getting frequent calls for intoxicated homeless people who just wanted somewhere to eat, sleep and stay warm or cool (depending on the time of season), drug seekers, lonely elderly people who have been sick for days and call 911 at 3 am because they can't sleep and want someone to talk to; septic, contracted, debilitated nursing home residents who aspirated Jevity, gasping for air and were found wearing a simple oxygen mask with only three liters per minute of o2 just to name a few. I get it. I know you're frustrated and burned out. But don't take that anger and frustration out on "ambulance drivers" and/or your patients. Nobody is forcing you to stay where you are. If you don't like it, leave. I have done so with other jobs and I couldn't have been happier.