It is sort of sad when you have to box up the stuff of a WAS (or you don't have to I suppose but when you choose to or they ask for their things).
For me it was sort of a purging. And I must say once my H took his things the energy of the house changed and I sort of really felt like my house was mine. Now that a few years have passed it feels like I have lived here on my own for a long time and it feels nice.
And maybe it won't be your key to detachment but it will be a step forward for you.
I agree that all you need to say to your W is you are not ready to discuss anything at this time. Whatever reaction she has to that is hers to deal with. Detaching "on command" is not easy and feels rather forceful (at least it did to me) but giving yourself lots of space to regroup your brain will help. She might get angry and that is okay too - the real trick (and trust me, it's a trick!) is to allow her to deal with her stuff on her own and you deal with your stuff on your own.
Blocking her from FB or whatever "extra" communication she has (aside from your child of course) are ways to create space for you.
