Dear Lynn,
I suppose there are no words that can comfort you, nor Diane's family at this moment. I know this because I have been in that road of grief and loss (I've lost my father and my older sister (my only sister), many, many years ago).
Anything that anyone can tell you or Diane's family makes no sense at this moment. But the truth is that, time is our best friend when we lose someone, because time does heal everything. So do let time do its job...
There's a Portuguese word: "saudades" that cannot be translated in English.
Having "saudades" is, in this case, being able to remember Diane without the pain, the tears, the anger of her loss. It's a peaceful feeling, because you miss the person or anything else with sadness...
Time will help you and Diane's family to fell "saudades" of her... It takes time but it will happen, I'm sure about that.
Allow me, if I may to make a suggestion: why not a treasury about Diane?
May you and Diane's family be comforted in this painful moment.
Ema