My advise would be to let her lead you, be there, acknowledge the sadness, and do your best to answer her questions---just the ones she asks, simply as you can, no need to go into long explanations. And, give yourself a break, your daughter will likely absorb the information she needs and let the rest go. Hugs to you and her. You are her mom, just be there for her, she won't be judging you, and will let you know what she wants/doesn't.....so sorry, this is tough. it's never too soon to talk about remembering, things to do---the grieving doesn't necessarily follow a certain pattern or rhythm...changes over time...she will always remember.