I think for you question about Grace living with Don she was lying about that because remember at the part where jack and Anna burn grace’s belongings in the field when they are leaving jack looks back at the stuff and says he sees someone in a window of an abandoned building which we later find out is indeed grace since Anna claims they burned the items in front of her so I think that after grace left jack and quit her job she ended up living in that abandoned building but didn’t wanna reveal that