Generally speaking, a doe that successfully raised fawns should still have her fawn(s) travelling with her during deer season.  However, that is not always a given, but it is the norm.  If her fawn died/was killed very close to season, I suspect she would still be lactating.  I don't know why this is, but data on how long a doe will stay lactating after weening her fawns is hard to come by.  No one has published any research on that topic.  From what I've seen, if a doe successfully raises a fawn into September, she will continue to have milk in her udder through November, but after that, it gets iffy.  If her fawn(s) is/are still alive, even after weening, they instinctively keep nuzzling their mom's udder long after, which keeps milk flowing, and a doe that still has fawns with her will usually still be lactating into at least mid-December.