I will pray for both of you. I had to make that hard decision a few years ago and it's very difficult to do, but I felt like my Sasha was ready, she was 15. She too had diabetes, along with kidney failure and a tumor in her mouth. I made the decision that she had lived a long happy healthy life and she was ready. I think I cried for weeks after, but knew in my heart it was the right decsion for her, couldn't stand to see her suffer any longer.
God Bless you and Josh.