The loss of a dear friend

I'm preparing for our retreat at Trefeca college from 22nd to 24th January. I can do with a retreat right now to be honest with you, because yesterday, a dear friend of mine was found dead in the sea off Penarth - she'd gone way beyond our reach into her own personal hell. I've spend a lot of time soul-searching since; was there more I could have done to help her, etc? I'm looking forward to sharing with others my sense of loss and inadequacy and to unburden myself of the guilt I feel because I made it and she, and countless others, didn't.