It seems to me that maybe you were a little reluctant to let them hold her and now you regret letting them. These are all perfectly normal emotions, expected emotions, and please do not blame yourself. It is not your fault. I imagine you have replayed those 35 days and your pregnancy over and over, thinking if this, then that, or what if this... As bad as it hurts, you can't change what happened. You can't bring her back. Tormenting yourself won't help. Cherish the moments you do have. Naomi is in heaven, and she wants you to be happy. Grandma and Auntie got to her hold and share in her special life.
I am so sorry for your loss. I wish I could give you a big hug and make the pain go away.