So Sad And Feeling Guilty

Hello every one,

My heart is broken because my lovely Schnauzer Luna, died on wednesday, she was 11 years old.
She was fine until october, when we noticed she was coughing. We took her to the vet, and after some x rays, she told us that her heart had grown in size, and that this was causing her heart failure.
We took her to the cardiologist, who did an eco cardiogram and an electro cardiogram, and told us, that Luna had a heart abnormality that was pushing her heart to the limit, and eventually her lungs would fail.
He prescribed medicines. One of those medicines was a diuretic that would make her urinate very frequently. I am being very honest, eventhough it hurts as I tell you, that we could not keep on giving the diuretic, because every corner of the house was wet, I could not be home with her as I should have because of work, so having her all day inside a crate was out of the question. She developed edema in her lungs, and after a very hard day on wednsday (wich I also think I could've ´prevented if I had taken her to the vet earlier), with breathing difficulty, she died.
My husband, son and I, we cuddled her while we were taking her to the vet, we told her how much we loved her, how thankful we were for all the years we were blessed to receive her love and company, I asked her for forgiveness, because I felt, and still feel, that I could have done more for her, just to gain a few more days of her with us, and see her more peaceful. We cried together feeling so helpless. I feel today that she gave me way more than I gave in return. That feeling is really making me sad.
After she died, we had a few minutes with her, and we prayed, cried and thanked her again.
I wish I could have done things different, I blame myself for not doing more. I am lost in guilt and sadness, and I think that if I could not take good care of Luna I should not have another dog in my life. I should be glentler on my self (or my husband), but I cant help it.
I loved Luna very much, my family loved her and she has a very special place in our hearts. My daughter who lives in another city, came for Christmas and could hug her angel friend and fill her with love.
Thanks for allowing me to share my feelings with you. I hope you don't judge me.
I hope Luna will forgive me from heaven and love me because I love her and miss her with all my heart.

Luna's mom