Thank you everyone, for the advice and support (and tough love too 

) before and for the kindness and understanding after  

I had been letting the folks here know that I won't want to talk about it, and just a "sorry for your loss" and get on with things, please, and all the adults have respected that.  But the kids ...  

  However, they are so open and matter-of-fact about it all that in fact it's been quite cathartic, being able to talk about it the same way, openly and matter-of-fact.  
Today Ivy, who's 10, came round with a card she had made, and a flower.
The card has on the front a really rather accurate artwork of Dot and reads, 
"Dot's good byes
I love you but I know you are a bit funny with kids."
and inside,
"To Sally
I'm so sorry.  There's nothing I can do but I can say my goodbyes. 
Goodbye Dot.  I miss you, Ivy xxx"
I dunno, these kids.  Makes you almost think perhaps the human race isn't doomed...   
  