Please accept my condolences on the loss of your beloved Suki. My heart went out to you when I read your post. It is hard enough to lose a fur child under the best conditions, but to feel you are at fault must be absolutely excruciating. I know you are in a lot of pain.
Without going into detail, I'll tell you that as a youngster, my negligence led to the death of a pet. It haunted me for decades. After a long time, I was able to forgive myself, as I had asked the pet and God to forgive me for many years. I'm sure it was easier for them to forgive me than it was for me to forgive myself. All that time, I think I held myself to a higher than human standard, whereas I could have more easily forgiven someone else if they had been responsible.
I'm sure that Suki does not hold you responsible in any way, and as Jennifer said, dogs are all about love. I am sure that LeeLoo already loves you and will grow to trust you more and more over time. You deserve her love and trust, and at some point you will see that for yourself.
In the meantime, be good to yourself and look for the good things happening in your life. This one event does not define Suki's life with you. I hope that the love and good times the two of you shared will soon overshadow this one event that has tortured you so much.