Your post made me tear up. Although we are at different stages of life, I can fully identify with your feelings. The sudden, tragic loss of my father forever changed who I am. It'll be 3 years in November, but it feels like it's been 3 months. Nothing is the same, and some days, I am still in shock. Like you, WDW was our perfect place. Our happiest memories were created there, and whenever I return, I feel his presence constantly.
With time, my relationship with my mother has grown stronger than ever. I pray the same happens for you and your daughter.