I am so very sorry for their loss. Like many others, know too well the empty place it makes in your heart. May you find Peace in knowing you did all you could and Angel knew this too. Take care of her foal for her.
This is such sad news; I am so very sorry for Mary and her husband. Try to think of Angel now free of suffering at the Rainbow Bridge, where we all will be reunited with all of our beloved animals....and may the filly she left behind carry on her memory here,and fill your hearts with your love for her.
I haven't been here very much lately as life has been exceptionally busy so I'm not sure what happened with little Miss Angel, but my sincerest condolences to Mary and her family over the loss of their mare.