As well as emotional support she will inevitably need help with all the cold, hard but necessary practical stuff she's now going to be forced to deal but probably isn't in a fit state for..... possible inquest, funeral arrangement, bank accounts, insurance policies (though possibly null and void in the circumstances) and loads of other overwhelming stuff. Maybe offer to help deal with some of those things to relieve her of some of the burden. Having to deal with those things, although a burden, can also help as they provide a distraction and something to focus on.