Congrats! The feeling of being a grandmother for the first time is indescribable! There IS something special about that first one even though you will adore any further DGBs. My first is 21, almost 22, and he's still my baby. He allows me to call him that but my DGD won't let me for some reason. She's 16 going on 17!!
Keep us posted on your DDIL's progress and hopefully things will go smoothly!!