Sorry about the sad news. Just think that you should realise that you have done as much as anyone could have.
I doubt trained professionals could have done more, I have a sister who has been in your situation who is one of this countries best trained and most experienced A&E Nurses and have heard many stories of how they battle to save lives and often fail. At least that girl had some one with her, some one who cared and who did all you could. AS others have said, don't bottle it up, just let it out. You certainly have the admiration and respect of myself and alot of others some who know you and some like me that don't.
EV2 mk2 with 2009 big Nikko
HW97K with 6-24 Nikko Nighteater