So sorry to hear they are gone, you did everything you could and gave her every chance but were brave enough to let her go - she was lucky to have you .
Oh my poor girl I've been following your posts and just wanted you to know how much I'm thinking of your and your poor mare. Sometimes nature can be so cruel and even when you have done everything possible still this happens. I lost my "lifetime best friend" unexpectedly last June & yes I do know how awful it feels. Please look after yourself really well, howl when you need to and take whatever comfort you can that you gave your girl a peaceful end. Sending you lots of (((((Hugs))))) & much love