I would not bring it up to your daughter anytime right away. Just be there for her and let her know that all is okay. Yes, the shock with wear off and she will learn to trust that you will be there, but the memory won't, from my experience. Memories like that fade over time but they don't go away. Some of my most poignant memories was when I was 4 and 5 years old, and I am in my 40's now. Some people look at me in disbelief when I say that until they talk to me and ask me about them....

The important thing is to show her love and trust and she will survive and thrive, and one day when she's older, when she has the ability to understand, bring it up. Bring it up in a way that if she doesn't remember it won't bring it back, but in my opinion, it does need to be brought up eventually so you can both be at peace.