I feel your pain. I have 3 dogs here. Two of then are diabetic needing 2 shots of insulin daily. One of them has bladder cancer that has metastasized causing a tennis ball sized tumor on his chest/shoulder. He won't see July. I tear up thinking of not having him in my life, I try to keep in mind that he had a great life with filled with love and quality care keeping him happy. The non diabetic dog has liver cancer and is now 20 pounds down from nearly 45 pounds. He too most likely won't see July. The other diabetic dog has a seizure disorder.
This will be the 3rd and 4th dogs that have passed. It is hard but I did make it thru. I still get choked up thinking of them from time to time.
You should focus on the wonderful life you provided for your baby. Remember the good times and know that you will get thru this in time. Your baby would want you to keep on your path and stick to your diet and give yourself have a healthy quality future. When you reach for something not on your diet when you are feeling down instead of eating, drink a big glass of water.
Let yourself grieve. Give yourself the gift of knowing that your baby loved you and she will always be with you.
I wish you the best, stay strong and be good to yourself.