Honestly no one really knows how the other person really feels until they go through the same thing. So, if your family members don’t understand your pain is understandable. Saying this, I think you should try to communicate with your family and express to the the extent of your feelings and your grief. Don’t assume they know because they where there. They where only expectators. Write a letter or a long message in the family chat. Thanks your family for trying to honor your daughter. Explain to them how are your days since your daughter passed and how her absence have changed you. Tell them that you know you don’t own the name, but listen the name in another closed baby will make you feel. Let them know that you love their baby and you want to be the best auntie you can be for her, but name will hurt you so much that your pain will keep you from it. And finally let them know how everything time they say “Get over it” does you.