I am so, so sorry for you, your family and your little Gracie.
I agree with those that said time will heal, and possibly getting her a little friend that she can bond with and ease her missing her daddy so much. I think it's just like us when dealing with a loss, time and putting our focus on other things really heals wounds or at least makes them easier to deal with. I'll be thinking and praying for you and Gracie. Please keep us updated on how she's doing.