Hi Bunny,
I'm so sorry to hear of your loss and sadness. It is perfectly normal to grieve the loss of your pet. Like you said, she was always there for you and those are the memories that you need to hold on to. She was hurting and you did the right thing by her. She is not suffering anymore.
Try to make your tears into tears of happiness for the wonderful pet that she was to you. Nobody can ever take that away from you. I'm wrapping my arms around you to give you a big warm hug.