Hi, is there any fungus there? Doesnt seem to be any 'pieces' that they can work with. One of the indicators of this is that they ignored the leaves and took the grape. Leaf Cutters will drink and eat the sweetness of the grapes as a temporary substitute for no fungus. If all of the fungus is dead you will need to get some more fungus quickly to get this colony going. Monitor this, I would say by now there should be a little piece of reformed fungus that the ants can work on. If not, there may not be any fungus left.
I think you may be right, Checked on them today. They moved the queen to underneath the nursery enclosure directly on top of the clay balls. I'm unable to see if there is any healthy fungus but there is a lot of dead fungus in the waste pile. Really gutted, this seems to be over before I even started :/