I dont want to sound harsh at all because I frightened my daughters too, but you must remember the girls just lost their mum theyre devastated too and probably just as upset as you over the jewellery ,.its their memorys too.
Not only that but they see the other rock in their lives ,you,crumbling and they're trying to stay strong for you.
Imagine how terrified your eldest must have been with the incident last week even though it was an error,she may need reassuring on that. You can't help crumbling of course you can't but they're in bits too,
plus your youngest has a new baby that's a time in all our lives when we really need our mums,both my daughters have said that.she can't have her mum but she needs her dad too.
You're all of you in bits and you need to help each other rebuild.Forget the nasty text she is just lashing out.
You could apologise and explain you realise they are grieving too,maybe re assure them that they are not going to lose you too,through any deliberate action you take
do as EMZ says sugest you all go for a walk and take the baby, and then the baby is a focal point a little person who needs all of you and who can unknowingly relieve any tension that arises just by being there.
Maybe you are pushing the jewellery thing too fast perhaps you could all agree that it can wait put it in a drawer and come back too it in a few months,maybe then those memory's will be shared but with smiles about the occasions they invoke and help you all to heal a bit.