Advice for my sister 😔

So I’m not sure where to start. But I wanted to ask y’all what advice I should tell my sister or words of comfort. In October she found out she was pregnant, it was an unplanned pregnancy. She’s already a mother of a 6 year old but it’s a complicated situation. We started to warm up to the fact she was going to have another baby. Today she found out that she was 2 months but that the baby’s heart stopped beating a week ago. I’ve told her everything happens for a reason, and maybe it just wasn’t quite the time to have another child. I personally haven’t been through such a sad experience. If anyone would like share some kind thoughts I can give her throughout this rough time. 😢💗