I need advice on something serious...today I found out one of my students father killed himself. Her…

I need advice on something serious...today I found out one of my students father killed himself. Her stepdad told me and they don't know how or when to tell her. But I know that she will def say something to us. She's 3 years old and don't know how to react if she comes up to me and says "ms.sami. My dad died" I'm not good in those situations and to have a small child come to me with at, I'm kinda nervous. I know this is a serious thing but I need advice.