You can't be disfellowshipped OR disassociated if you've never been baptized.exactly... and not even a marking talk ... no cards in any congregation file as an un-baptised publisher...
Members are taught to shun ones who automatically disassociate themselves by no longer remaining politically neutral... joining the military. As long as they are not attending cong mtngs, no announcement made.
If she or her sister were to attend mtngs occasionally might be a different story. Most likely assigned a handler study conductor like MJ or Prince were, to limit media damage and to court large donations.