there are many various reasons for fainting, some minor others more dangerous including but not limited to infection, fever, dehydration, heart related issues, neurological related issues, orthostatic problems, ANS problems, electrolyte imbalances etc etc
it may take awhile for her dr's to find out what is causing it; what I would do is take each issue you've listed and write a date, times and symptoms and keep a journal/log to see if you can find a pattern - any history of previous faints or family history? any family history on either side of sudden cardiac arrest/death or a family member dying <35 w/o a cause?
it could be that she has some underlying issues with the ANS that is worsened by say the tonsils being infected, not drinking enough lead to dehydration, and could even possibly have lead to an electrolyte imbalance
on thing that's important is that her teachers and others around her know she faints and to watch for it so she doesn't hurt herself in the falls. I've had syncope (fainting) since age 9 and have fainted in just about every way you could think of and dr's think part of my spine and head injuries is from 35+ years of falls.
one thing that comes to mind is the blue around the mouth; does she or has she had Asthma/breathing problems? I have 2 children with asthma and that's what happens with them; loss of oxygen and difficulty breathing. when my oldest daughter was 5 or 6 she started fainting but then it stopped as she grew older.
You could ask her dr for a soft helmet so she doesn't suffer any head injuries during the faints; my insurance pays for mine but I still suffered a concussion and contusion a few months ago hitting the side of my tiled tub - so it may not work in all instances but it's worth a try just in case
has the dr suggested a saline solution mist for the nosebleeds? that may work so ask about it - one great thing a paramedic taught me 25 years ago for nosebleed is to take ice or a freezer pack, put it in a baggie wrap it in a cloth, tilt the head forward and put the ice on the base of the neck - it freezes the nerve and almost always stops the nosebleeds =)
I am sorry to here this is happening. You should get a WBC and CBC. I pray everything turns out good and she feels better.
Regards
jonathan
Sorry to read your young daughter is having such a hard time. It seems strange the doctors haven't been able to find a cause.
If you don't get any help here you may want to make the same or similar post on:
http://www.medhelp.org/forums/Pediatric-Cardiology/show/302
You could also look through the list of Forums (click on first pull-down menu at top of this page, opposit MedHelp banner) and see if any other listing may sound like possible help.
Good luck, I hope it all passes and your young daughter doesn't have any more episodes.